Math functions implementation

# Conflicts:
#	SharpCalculator.Avalonia/MainWindow.axaml
#	SharpCalculator.Avalonia/MainWindow.axaml.cs

FusionCalculator

@@ -1 +1 @@
-Subproject commit 2a4f92fe351882a489c330ba82504d319df14c73
+Subproject commit d83106358fbf7293a112d6f3c75f6113e546aa09

SharpCalculator.Avalonia/App.axaml

@@ -3,6 +3,31 @@
              x:Class="SharpCalculator.Avalonia.App"
              RequestedThemeVariant="Dark">
     <Application.Styles>
+        
         <SimpleTheme />
+        
+        <Style Selector="Control.center">
+            <Setter Property="HorizontalAlignment" Value="Center"/>
+            <Setter Property="VerticalAlignment" Value="Center"/>
+        </Style>
+        
+        <Style Selector="Button.cirlce">
+            <Setter Property="Height" Value="60"/>
+            <Setter Property="Width" Value="60"/>
+            <Setter Property="CornerRadius" Value="30"/>
+            <Setter Property="HorizontalAlignment" Value="Center"/>
+            <Setter Property="VerticalAlignment" Value="Center"/>
+            <Setter Property="HorizontalContentAlignment" Value="Center"/>
+            <Setter Property="VerticalContentAlignment" Value="Center"/>
+        </Style>
+        
+        <Style Selector="Button.gray">
+            <Setter Property="Background" Value="Gray"/>
+        </Style>
+        
+        <Style Selector="Button.orange">
+            <Setter Property="Background" Value="#C07500"/>
+        </Style>
+        
     </Application.Styles>
 </Application>

SharpCalculator.Avalonia/App.axaml.cs

@@ -1,4 +1,10 @@
-using Avalonia;
+global using System;
+global using System.Collections.Generic;
+global using System.Globalization;
+global using Avalonia;
+global using Avalonia.Controls;
+global using Avalonia.Interactivity;
+global using Avalonia.Media;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
 

SharpCalculator.Avalonia/MainWindow.axaml

@@ -1,571 +1,162 @@
 <Window
-    FontFamily="Consolas"
-    FontSize="24"
-    Height="750"
-    Title="SharpCalculator"
-    Width="600"
-    mc:Ignorable="d"
-    x:Class="SharpCalculator.Avalonia.MainWindow"
     xmlns="https://github.com/avaloniaui"
-    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    x:Class="SharpCalculator.Avalonia.MainWindow"
-    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    Title="SharpCalculator"
+    Icon="avares://SharpCalculator.Avalonia/assets/icon.ico"
+    FontFamily="Consolas" FontSize="24"
+    Width="460" Height="570">
 
-    <Grid
+    <Grid Margin="10">
-        HorizontalAlignment="Center"
+        <Grid.RowDefinitions>1* 40 1* 330</Grid.RowDefinitions>
-        Margin="20"
+
-        VerticalAlignment="Center">
+        <TextBox Name="Input" Grid.Row="0"
+                 TextChanged="Input_OnTextChanged"
+                 BorderThickness="2"
+                 BorderBrush="#AAAAAA"
+                 TextWrapping="Wrap"/>
+        
+        <TextBlock Grid.Row="1" 
+                   VerticalAlignment="Center" 
+                   Foreground="#AAAAAA"
+                   Text="="/>
+        <TextBox Name="Output" Grid.Row="1" 
+                 Margin="16 0 0 0" 
+                 VerticalAlignment="Center"
+                 VerticalContentAlignment="Center"
+                 IsReadOnly="True"
+                 BorderThickness="0"
+                 TextWrapping="NoWrap"/>
+        
+        <TextBox Name="History" Grid.Row="2"
+                 Foreground="Gray"
+                 BorderThickness="1"
+                 BorderBrush="Gray"
+                 IsReadOnly="True"
+                 TextWrapping="NoWrap"
+                 FontSize="18"/>
+        
+        <Grid Grid.Row="3" VerticalAlignment="Bottom"
+              MinWidth="440" MaxWidth="440" MinHeight="320" MaxHeight="320">
             <Grid.ColumnDefinitions>* * * * * * *</Grid.ColumnDefinitions>
-
+            <Grid.RowDefinitions>* * * * *</Grid.RowDefinitions>
-        <Grid.RowDefinitions>* * * * * * * * * *</Grid.RowDefinitions>
             
             <!--  1st row  -->
             
-        <TextBlock
+            <Button Classes="cirlce gray" Grid.Column="0" Grid.Row="0"
-            FontSize="40"
+                Click="ClearButton_OnClick" Content="AC"/>
-            Grid.Column="0"
+
-            Grid.ColumnSpan="7"
+            <Button Classes="cirlce gray" Grid.Column="1" Grid.Row="0"
-            Grid.Row="1"
+                Click="MathButton_OnClick" Content="("/>
-            HorizontalAlignment="Right"
+            
-            Name="Input"
+            <Button Classes="cirlce gray" Grid.Column="2" Grid.Row="0"
-            Text="" />
+                Click="MathButton_OnClick" Content=")" />
+            
+            <Button Classes="cirlce orange" Grid.Column="3" Grid.Row="0"
+                Click="MathButton_OnClick" Content="/"/>
+
+            <Button Classes="cirlce gray" Grid.Column="4" Grid.Row="0"
+                Click="MathButton_OnClick" Content="1/x"/>
+
+            <Button Classes="cirlce gray" Grid.Column="5" Grid.Row="0"
+                Click="MathButton_OnClick" Content="sin"/>
+
+            <Button Classes="cirlce gray" Grid.Column="6" Grid.Row="0"
+                Click="MathButton_OnClick" Content="asin"/>
 
             <!--  2nd row  -->
 
-        <Button
+            <Button Classes="cirlce" Grid.Column="0" Grid.Row="1"
-            Background="Gray"
+                Click="MathButton_OnClick" Content="7"/>
-            Click="ClearButton_OnClick"
-            Content="AC"
-            Grid.Column="0"
-            Grid.Row="2"
-            Name="ClearButton"/>
 
-        <Button
+            <Button Classes="cirlce" Grid.Column="1" Grid.Row="1"
-            Background="Gray"
+                Click="MathButton_OnClick" Content="8"/>
-            Click="MathButton_OnClick"
-            Content="("
-            CornerRadius="30"
-            Grid.Column="1"
-            Grid.Row="2"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
-        <Button
-            Background="Gray"
-            Click="MathButton_OnClick"
-            Content=")"
-            CornerRadius="30"
-            Grid.Column="2"
-            Grid.Row="2"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
-        <Button
-            Background="Orange"
-            Click="MathButton_OnClick"
-            Content="/"
-            CornerRadius="30"
-            Grid.Column="3"
-            Grid.Row="2"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
             
-        <Button
+            <Button Classes="cirlce" Grid.Column="2" Grid.Row="1"
-            Background="Gray"
+                Click="MathButton_OnClick" Content="9"/>
-            Click="MathButton_OnClick"
-            Content="^"
-            CornerRadius="30"
-            Grid.Column="4"
-            Grid.Row="2"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
             
-        <Button
+            <Button Classes="cirlce orange" Grid.Column="3" Grid.Row="1"
-            Background="Gray"
+                Click="MathButton_OnClick" Content="*"/>
-            Click="MathButton_OnClick"
-            Content="sin"
-            CornerRadius="30"
-            Grid.Column="5"
-            Grid.Row="2"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce gray" Grid.Column="4" Grid.Row="1"
-            Background="Gray"
+                Click="MathButton_OnClick" Content="^"/>
-            Click="MathButton_OnClick"
-            Content="asin"
-            CornerRadius="30"
-            Grid.Column="6"
-            Grid.Row="2"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <!--  3rd row  -->
+            <Button Classes="cirlce gray" Grid.Column="5" Grid.Row="1"
+                Click="MathButton_OnClick" Content="cos"/>
 
-        <Button
+            <Button Classes="cirlce gray" Grid.Column="6" Grid.Row="1"
-            Click="MathButton_OnClick"
+                Click="MathButton_OnClick" Content="acos"/>
-            Content="7"
-            CornerRadius="30"
-            Grid.Column="0"
-            Grid.Row="3"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <!--  3th row  -->
-            Click="MathButton_OnClick"
-            Content="8"
-            CornerRadius="30"
-            Grid.Column="1"
-            Grid.Row="3"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
-        <Button
-            Click="MathButton_OnClick"
-            Content="9"
-            CornerRadius="30"
-            Grid.Column="2"
-            Grid.Row="3"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
-        <Button
-            Background="Orange"
-            Click="MathButton_OnClick"
-            Content="*"
-            CornerRadius="30"
-            Grid.Column="3"
-            Grid.Row="3"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce" Grid.Column="0" Grid.Row="2"
-            Background="Gray"
+                Click="MathButton_OnClick" Content="4"/>
-            Click="MathButton_OnClick"
-            Content="e"
-            CornerRadius="30"
-            Grid.Column="4"
-            Grid.Row="3"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce" Grid.Column="1" Grid.Row="2"
-            Background="Gray"
+                Click="MathButton_OnClick" Content="5"/>
-            Click="MathButton_OnClick"
-            Content="cos"
-            CornerRadius="30"
-            Grid.Column="5"
-            Grid.Row="3"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce" Grid.Column="2" Grid.Row="2"
-            Background="Gray"
+                Click="MathButton_OnClick" Content="6"/>
-            Click="MathButton_OnClick"
+
-            Content="acos"
+            <Button Classes="cirlce orange" Grid.Column="3" Grid.Row="2"
-            CornerRadius="30"
+                Click="MathButton_OnClick" Content="-"/>
-            Grid.Column="6"
+
-            Grid.Row="3"
+            <Button Classes="cirlce gray" Grid.Column="4" Grid.Row="2"
-            Height="60"
+                FontSize="22"
-            HorizontalAlignment="Center"
+                Click="MathButton_OnClick" Content="10^x"/>
-            HorizontalContentAlignment="Center"
+
-            Margin="5"
+            <Button Classes="cirlce gray" Grid.Column="5" Grid.Row="2"
-            VerticalAlignment="Center"
+                Click="MathButton_OnClick" Content="tg"/>
-            VerticalContentAlignment="Center"
+
-            Width="60" />
+            <Button Classes="cirlce gray" Grid.Column="6" Grid.Row="2"
+                Click="MathButton_OnClick" Content="atg"/>
 
             <!--  4th row  -->
 
-        <Button
+            <Button Classes="cirlce" Grid.Column="0" Grid.Row="3"
-            Click="MathButton_OnClick"
+                Click="MathButton_OnClick" Content="1"/>
-            Content="4"
-            CornerRadius="30"
-            Grid.Column="0"
-            Grid.Row="4"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce" Grid.Column="1" Grid.Row="3"
-            Click="MathButton_OnClick"
+                Click="MathButton_OnClick" Content="2"/>
-            Content="5"
-            CornerRadius="30"
-            Grid.Column="1"
-            Grid.Row="4"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce" Grid.Column="2" Grid.Row="3"
-            Click="MathButton_OnClick"
+                Click="MathButton_OnClick" Content="3"/>
-            Content="6"
-            CornerRadius="30"
-            Grid.Column="2"
-            Grid.Row="4"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce orange" Grid.Column="3" Grid.Row="3"
-            Background="Orange"
+                Click="MathButton_OnClick" Content="+"/>
-            Click="MathButton_OnClick"
-            Content="-"
-            CornerRadius="30"
-            Grid.Column="3"
-            Grid.Row="4"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce gray" Grid.Column="4" Grid.Row="3"
-            Background="Gray"
+                Click="MathButton_OnClick" Content="e"/>
-            Click="MathButton_OnClick"
-            Content="10^x"
-            CornerRadius="30"
-            Grid.Column="4"
-            Grid.Row="4"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce gray" Grid.Column="5" Grid.Row="3"
-            Background="Gray"
+                Click="MathButton_OnClick" Content="ctg"/>
-            Click="MathButton_OnClick"
-            Content="tan"
-            CornerRadius="30"
-            Grid.Column="5"
-            Grid.Row="4"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce gray" Grid.Column="6" Grid.Row="3"
-            Background="Gray"
+                Click="MathButton_OnClick" Content="actg"/>
-            Click="MathButton_OnClick"
-            Content="atan"
-            CornerRadius="30"
-            Grid.Column="6"
-            Grid.Row="4"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
             <!--  5th row  -->
 
-        <Button
+            <Button Classes="cirlce" Grid.Column="0" Grid.Row="4"
-            Click="MathButton_OnClick"
+                Click="MathButton_OnClick" Content="0"/>
-            Content="1"
-            CornerRadius="30"
-            Grid.Column="0"
-            Grid.Row="5"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce" Grid.Column="1" Grid.Row="4"
-            Click="MathButton_OnClick"
+                Click="MathButton_OnClick" Content="."/>
-            Content="2"
-            CornerRadius="30"
-            Grid.Column="1"
-            Grid.Row="5"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce" Grid.Column="2" Grid.Row="4"
-            Click="MathButton_OnClick"
+                Click="MathButton_OnClick" Content="%"/>
-            Content="3"
-            CornerRadius="30"
-            Grid.Column="2"
-            Grid.Row="5"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce orange" Grid.Column="3" Grid.Row="4"
-            Background="Orange"
+                Click="ResultButton_OnClick" Content="="/>
-            Click="MathButton_OnClick"
-            Content="+"
-            CornerRadius="30"
-            Grid.Column="3"
-            Grid.Row="5"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce gray" Grid.Column="4" Grid.Row="4"
-            Background="Gray"
+                Click="MathButton_OnClick" Content="π"/>
-            Click="MathButton_OnClick"
-            Content="rand"
-            CornerRadius="30"
-            Grid.Column="4"
-            Grid.Row="5"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce gray" Grid.Column="5" Grid.Row="4"
-            Background="Gray"
+                FontSize="22"
-            Click="MathButton_OnClick"
+                Click="MathButton_OnClick" Content="rand"/>
-            Content="ctg"
-            CornerRadius="30"
-            Grid.Column="5"
-            Grid.Row="5"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
 
-        <Button
+            <Button Classes="cirlce gray" Grid.Column="6" Grid.Row="4" 
-            Background="Gray"
+                Click="MathButton_OnClick" Content="ln"/>
-            Click="MathButton_OnClick"
+            </Grid>
-            Content="actg"
-            CornerRadius="30"
-            Grid.Column="6"
-            Grid.Row="5"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
-
-        <!--  6th row  -->
-
-        <Button
-            Click="MathButton_OnClick"
-            Content="0"
-            CornerRadius="30"
-            Grid.Column="0"
-            Grid.Row="6"
-            Height="55"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalContentAlignment="Center"
-            Width="60" />
-
-        <Button
-            Click="MathButton_OnClick"
-            Content="%"
-            CornerRadius="30"
-            Grid.Column="1"
-            Grid.Row="6"
-            Height="55"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalContentAlignment="Center"
-            Width="60" />
-
-        <Button
-            Click="MathButton_OnClick"
-            Content="."
-            CornerRadius="30"
-            Grid.Column="2"
-            Grid.Row="6"
-            Height="55"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
-
-        <Button
-            Background="Orange"
-            Click="ResultButton_OnClick"
-            Content="="
-            CornerRadius="30"
-            Grid.Column="3"
-            Grid.Row="6"
-            Height="55"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
-
-        <Button
-            Background="Gray"
-            Click="MathButton_OnClick"
-            Content="π"
-            CornerRadius="30"
-            Grid.Column="4"
-            Grid.Row="6"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
-
-        <Button
-            Background="Gray"
-            Click="MathButton_OnClick"
-            Content="1/x"
-            CornerRadius="30"
-            Grid.Column="5"
-            Grid.Row="6"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
-
-        <Button
-            Background="Gray"
-            Click="MathButton_OnClick"
-            Content="log"
-            CornerRadius="30"
-            Grid.Column="6"
-            Grid.Row="6"
-            Height="60"
-            HorizontalAlignment="Center"
-            HorizontalContentAlignment="Center"
-            Margin="5"
-            VerticalAlignment="Center"
-            VerticalContentAlignment="Center"
-            Width="60" />
-
-        <!--  7th row  -->
-
-        <TextBlock
-            FontSize="25"
-            Grid.Column="0"
-            Grid.ColumnSpan="7"
-            Grid.Row="7"
-            Name="History1"
-            Text="" />
-
-        <!--  8th row  -->
-
-        <TextBlock
-            FontSize="25"
-            Grid.Column="0"
-            Grid.ColumnSpan="7"
-            Grid.Row="8"
-            Name="History2"
-            Text="" />
-
-        <!--  9th row  -->
-
-        <TextBlock
-            FontSize="25"
-            Grid.Column="0"
-            Grid.ColumnSpan="7"
-            Grid.Row="9"
-            Name="History3"
-            Text="" />
     </Grid>
 </Window>

SharpCalculator.Avalonia/MainWindow.axaml.cs

@@ -1,129 +1,106 @@
-// This implementation of the calculator using
-// multi-translating programming language Fusion.
-// The main logic was written on the Fusion, 
-// then retranslated into c#, 'out' module in FusionCalculator
-// is a translated c# code, that used by SharpCalculator module.
-// If you want to dive into the logic of the calculator,
-// you need to check 'out' folder in FusionCalculator module.
-
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Globalization;
-using System.Linq;
-using System.Threading.Tasks;
-using Avalonia.Controls;
-using Avalonia.Interactivity;
 using FusionCalculator;
-using Avalonia.Media;
-
 
 namespace SharpCalculator.Avalonia;
 
 public partial class MainWindow : Window
 {
-    static Random _random = new Random(); // Random object for rand() function in calculator
+    private readonly Random Random = new();
-    double _randomNumber = _random.NextDouble(); // Random variable is between 0 to 1
-    private int _currentIndex = 0; // Current index for checking the length of input text, accordingly for clear button
-    
-    private List<string> _history = new List<string>();
     
     public MainWindow()
     {
         InitializeComponent();
     }
     
+    private void AppendToHistory(string line) //function of appending expression to the history list
+    {
+        // begin new line if not empty
+        if (!string.IsNullOrEmpty(History.Text))
+            History.Text += '\n';
+        /// add line without space characters
+        History.Text += line
+            .Replace("\t", " ")
+            .Replace("\n", " ")
+            .Replace("\r", " ")
+            .Replace("  ", " ");
+    }
+
     private void MathButton_OnClick(object? sender, RoutedEventArgs e)
     {
-        if (sender is not Button button) // Checking if button exist, if not throw Exception
+        if (sender is not Button button)
             throw new Exception();
         
-        string text; // declaring text for using it in switch case 
+        string buttonText = button.Content!.ToString()!; // declaring text for using it in switch case 
-        
+        Input.Text += buttonText switch
-        ClearButton.Content = "AC"; // clear button content changing to Accurate Clear mode
-        
-        switch (Input.Text) // Switch case for checking the inputting functions
         {
-            case "rand": // rand function add random variable from 0 to 1 into Input 
+            "rand" => // random number from 0 to 1 into Input 
-                Input.Text = "";
+                Random.NextDouble().ToString("0.#####", CultureInfo.InvariantCulture),
-                Input.Text += _randomNumber.ToString(CultureInfo.InvariantCulture);
+            "π" => // Pi constant
-                break;
+                "3.14159",
-            case "π": // Pi function add pi value into Input
+            "e" => // E constant
-                Input.Text = "";
+                "2.71828",
-                Input.Text += "3.1415";
+            "10^x" => // ten in power of x function 
-                break;
+                "10^",
-            case "e": // euler function add e value into Input
+            "1/x" => // one over x function
-                Input.Text = "";
+                "1/",
-                Input.Text += "2.71828";
+            "sin" or "cos" or "tg" or "ctg"
-                break;
+            or "asin" or "acos" or "atg" or "actg"
-            case "10^x": // ten in power of x function 
+            or "ln" => buttonText+'(',
-                Input.Text = "";
+            _ => buttonText
-                Input.Text += "10^";
+        };
-                break;
-            case "1/x": // one over x function
-                Input.Text = "";
-                Input.Text += "1/";
-                break;
-            default: // if there is no function input, then just input Button content
-                text = button.Content!.ToString()!;
-                Input.Text += text;
-                break;
-        }
     }
     
     private void ClearButton_OnClick(object? sender, RoutedEventArgs e)
-    {
-        // Checking the indexes and the emptiness of the input for clearing one by one
-        if (Input.Text != "" && _currentIndex < Input.Text!.Length)
-        {
-            if ((string)ClearButton.Content! == "AC") // if clear button content equal to AC, clear one by one
-            {
-                Input.Text = Input.Text.Remove(_currentIndex, 1);
-                _currentIndex++;
-            }
-            else if ((string)ClearButton.Content! == "C") // if clear button content equal to C, clear all
     {
         Input.Text = "";
+        Output.Text = "";
     }
-        }
+
-        else
+    private void UndoButton_OnClick(object? sender, RoutedEventArgs e)
     {
-            // Handle the case when there's no text or all characters are cleared
+        // delete last digit
-            _currentIndex = 0; // Reset the index for the next round
+        // if (!string.IsNullOrEmpty(Input.Text)) 
-        }
+        //     Input.Text = Input.Text.Remove(Input.Text.Length - 1);
+        Input.Undo();
     }
     
     private void ResultButton_OnClick(object? sender, RoutedEventArgs e)
     {
-        History1.Foreground = new SolidColorBrush(Colors.Gray);
+        if(Input.Text == null || Output.Text == null || Output.Text.StartsWith("Error"))
-        History2.Foreground = new SolidColorBrush(Colors.Gray);
-        History3.Foreground = new SolidColorBrush(Colors.Gray);
-        
-        if(Input.Text == null) // checking Input for nullability 
             return;
-        string exprStr = Input.Text; // expression variable, for print result
+        string expression = Input.Text;
+        string result = Output.Text;
+        AppendToHistory($"{expression}={result}");
+        Input.Text = result;
+    }
+
+    private void Input_OnTextChanged(object? sender, TextChangedEventArgs e)
+    {
+        if(Input.Text == null)
+            return;
+        
+        string exprStr = Input.Text; // mathematical expression
         try
         {
-            double rezult = Calculator.Calculate(exprStr); // result being processed by calculator object that implemented in FusionCalculator Module
+            // expression is being processed by Calculator class that implemented in FusionCalculator Module
-            if (!double.IsNaN(rezult))
+            double result = Calculator.Calculate(exprStr);
+            
+            // incomplete expression with no rezult
+            if (double.IsNaN(result))
+                Output.Text = "";
+            else if (Math.Abs(result) is >= 10e-5 and <= 10e15)
             {
-                Input.Text = rezult.ToString(CultureInfo.InvariantCulture);
+                // decimal number with 5-digit precision for regular numbers
-                _history.Add(rezult.ToString(CultureInfo.InvariantCulture));
+                Output.Text = result.ToString("0.#####", CultureInfo.InvariantCulture);
+            }
+            else
+            {
+                // scientific notation with 5-digit precision for big and small numbers
+                Output.Text = result.ToString("0.#####E0", CultureInfo.InvariantCulture);
             }
         }
         catch (Exception exception)
         {
-            Input.Text = "Error: "+exception.Message;
+            Output.Text = $"Error: {exception.Message}";
         }
-        
-        // Display the calculation history in the three TextBlocks
-        if (_history.Count > 0)
-            History1.Text = _history[0];
-        if (_history.Count > 1)
-            History2.Text = _history[1];
-        if (_history.Count > 2)
-            History3.Text = _history[2];
-
-        ClearButton.Content = "C"; // if the expression is printed, then change clear button content ot C, for clearing expression totally
     }
 }

SharpCalculator.Avalonia/Program.cs

@@ -6,9 +6,6 @@ namespace SharpCalculator.Avalonia;
 
 class Program
 {
-    // Initialization code. Don't use any Avalonia, third-party APIs or any
-    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
-    // yet and stuff might break.
     [STAThread]
     public static void Main(string[] args)
     {

SharpCalculator.Avalonia/SharpCalculator.Avalonia.csproj

@@ -7,6 +7,7 @@
         <ImplicitUsings>disable</ImplicitUsings>
         <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
         <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+        <ApplicationIcon>assets\icon.ico</ApplicationIcon>
     </PropertyGroup>
     
     <ItemGroup>
@@ -19,4 +20,8 @@
     <ItemGroup>
       <ProjectReference Include="..\FusionCalculator\FusionCalculator.csproj" />
     </ItemGroup>
+    
+    <ItemGroup>
+        <AvaloniaResource Include="assets\**"/>
+    </ItemGroup>
 </Project>

SharpCalculator.Tests/ComplicatedExpressionTests.cs

@@ -0,0 +1,35 @@
+namespace SharpCalculator.Tests;
+
+public class ComplicatedExpressionTests
+{
+    public ComplicatedExpressionTests()
+    {
+        CultureInfo.DefaultThreadCurrentCulture = CultureInfo.InvariantCulture;
+    }
+
+    [Theory]
+    [InlineData(0.9,2,3)]
+    public void Expression1(double a, double b, double c) => 
+        Assert.Equal( a/(b+c), Calculator.Calculate($"({a})/(({b})+({c}))"));
+
+    [Theory]
+    [InlineData(0.9,2,3)]
+    public void Expression2(double a, double b, double c) => 
+        Assert.Equal( Math.Sin(a)-b*Math.Cos(c), 
+            Calculator.Calculate($"sin(({a}))-(({b})*cos(({c})))"), 
+            FunctionTests.PRECISION);
+
+    [Theory]
+    [InlineData(0.9,2,3)]
+    public void Expression3(double a, double b, double c) => 
+        Assert.Equal( a*Math.Pow(b,c)+a*Math.Pow(b,c+1)+a*Math.Pow(b,c+2), 
+            Calculator.Calculate($"({a})*({b})^({c}) + ({a})*({b})^({c+1}) + ({a})*({b})^({c+2})"), 
+            FunctionTests.PRECISION);
+
+    [Theory]
+    [InlineData(0.9,2,3)]
+    public void Expression4(double a, double b, double c) => 
+        Assert.Equal(a/(b+Math.Tan(c)), 
+            Calculator.Calculate($"({a})/(({b})+tan(({c})))"), 
+            FunctionTests.PRECISION);
+}

SharpCalculator.Tests/FunctionTests.cs

@@ -0,0 +1,107 @@
+namespace SharpCalculator.Tests;
+
+public class FunctionTests
+{
+    public const int PRECISION = 8;
+    
+    public FunctionTests()
+    {
+        CultureInfo.DefaultThreadCurrentCulture = CultureInfo.InvariantCulture;
+    }
+
+    [Theory]
+    [InlineData(5)]
+    [InlineData(1)]
+    [InlineData(-3)]
+    [InlineData(-2)]
+    [InlineData(Math.PI/4)]
+    [InlineData(Math.PI/2)]
+    [InlineData(Math.PI*3/4)]
+    [InlineData(Math.PI*2)]
+    [InlineData(999)]
+    [InlineData(-999)]
+    public void Sin(double a) => 
+        Assert.Equal(Math.Sin(a), Calculator.Calculate($"sin({a})"), PRECISION);
+
+    [Theory]
+    [InlineData(5)]
+    [InlineData(1)]
+    [InlineData(-3)]
+    [InlineData(-2)]
+    [InlineData(Math.PI/4)]
+    [InlineData(Math.PI/2)]
+    [InlineData(Math.PI*3/4)]
+    [InlineData(Math.PI*2)]
+    [InlineData(999)]
+    [InlineData(-999)]
+    public void Cos(double a) => 
+        Assert.Equal(Math.Cos(a), Calculator.Calculate($"cos({a})"), PRECISION);
+
+    [Theory]
+    [InlineData(5)]
+    [InlineData(1)]
+    [InlineData(-3)]
+    [InlineData(-2)]
+    [InlineData(Math.PI/4)]
+    [InlineData(Math.PI/1.99)]
+    [InlineData(Math.PI*3/4)]
+    [InlineData(Math.PI*1.99)]
+    [InlineData(999)]
+    [InlineData(-999)]
+    public void Tan(double a) => 
+        Assert.Equal(Math.Tan(a), Calculator.Calculate($"tan({a})"), PRECISION);
+
+    [Theory]
+    [InlineData(5)]
+    [InlineData(1)]
+    [InlineData(-3)]
+    [InlineData(-2)]
+    [InlineData(Math.PI/4)]
+    [InlineData(Math.PI/2)]
+    [InlineData(Math.PI*3/4)]
+    [InlineData(Math.PI*1.99)]
+    [InlineData(999)]
+    [InlineData(-999)]
+    public void Ctg(double a) => 
+        Assert.Equal(1 / Math.Tan(a), Calculator.Calculate($"ctg({a})"), PRECISION);
+
+    [Theory]
+    [InlineData(0.9)]
+    [InlineData(1)]
+    [InlineData(-3)]
+    [InlineData(-2)]
+    public void Asin(double a) => 
+        Assert.Equal( Math.Asin(a), Calculator.Calculate($"asin({a})"), PRECISION);
+
+    [Theory]
+    [InlineData(0.9)]
+    [InlineData(1)]
+    [InlineData(-3)]
+    [InlineData(-2)]
+    public void Acos(double a) => 
+        Assert.Equal( Math.Acos(a), Calculator.Calculate($"acos({a})"), PRECISION);
+
+    [Theory]
+    [InlineData(0.9)]
+    [InlineData(1)]
+    [InlineData(-3)]
+    [InlineData(-2)]
+    public void Atan(double a) => 
+        Assert.Equal( Math.Atan(a), Calculator.Calculate($"atan({a})"), PRECISION);
+
+    [Theory]
+    [InlineData(0.9)]
+    [InlineData(1)]
+    [InlineData(-3)]
+    [InlineData(-2)]
+    public void Actg(double a) => 
+        Assert.Equal( Math.Atan(1 / a), Calculator.Calculate($"actg({a})"), PRECISION);
+
+    [Theory]
+    [InlineData(0.9)]
+    [InlineData(1)]
+    [InlineData(-3)]
+    [InlineData(-2)]
+    public void Ln(double a) => 
+        Assert.Equal( Math.Log(a), Calculator.Calculate($"ln({a})"), PRECISION);
+}

SharpCalculator.Tests/GlobalUsings.cs

@@ -0,0 +1,4 @@
+global using System;
+global using System.Globalization;
+global using Xunit;
+global using FusionCalculator;

SharpCalculator.Tests/OperatorTests.cs

@@ -0,0 +1,57 @@
+namespace SharpCalculator.Tests;
+
+public class OperatorTests
+{
+    public OperatorTests()
+    {
+        CultureInfo.DefaultThreadCurrentCulture = CultureInfo.InvariantCulture;
+    }
+
+    [Theory]
+    [InlineData(15,5)]
+    [InlineData(13,-6)]
+    [InlineData(-1,-6)]
+    [InlineData(-13,6)]
+    public void Sum(double a,double b) => 
+        Assert.Equal(a+b, Calculator.Calculate($"({a})+({b})"));
+
+    [Theory]
+    [InlineData(15,5)]
+    [InlineData(13,-6)]
+    [InlineData(-1,-6)]
+    [InlineData(-13,6)]
+    public void Subtract(double a,double b) => 
+        Assert.Equal(a-b, Calculator.Calculate($"({a})-({b})"));
+
+    [Theory]
+    [InlineData(15,5)]
+    [InlineData(13,-6)]
+    [InlineData(-1,-6)]
+    [InlineData(-13,6)]
+    public void Multiplying(double a,double b) => 
+        Assert.Equal(a*b, Calculator.Calculate($"({a})*({b})"));
+
+    [Theory]
+    [InlineData(15,5)]
+    [InlineData(24,-6)]
+    [InlineData(-12,-6)]
+    [InlineData(-36,6)]
+    public void Dividing(double a,double b) => 
+        Assert.Equal(a/b, Calculator.Calculate($"({a})/({b})"));
+    
+    [Theory]
+    [InlineData(2,5)]
+    [InlineData(1,-1)]
+    [InlineData(-3,-4)]
+    [InlineData(-2,2)]
+    public void Power(double a,double b) => 
+        Assert.Equal(Math.Pow(a,b), Calculator.Calculate($"({a})^({b})"));
+
+    [Theory]
+    [InlineData(5,2)]
+    [InlineData(1,-1)]
+    [InlineData(-3,-2)]
+    [InlineData(-2,2)]
+    public void Mod(double a,double b) => 
+        Assert.Equal( a%b, Calculator.Calculate($"({a})%({b})"));
+}

SharpCalculator.Tests/SharpCalculator.Tests.csproj

@@ -0,0 +1,28 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>disable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <IsPackable>false</IsPackable>
+        <IsTestProject>true</IsTestProject>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+        <PackageReference Include="xunit" Version="2.6.4" />
+        <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+        <PackageReference Include="coverlet.collector" Version="6.0.0">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\FusionCalculator\FusionCalculator.csproj" />
+    </ItemGroup>
+
+</Project>

SharpCalculator.sln

@@ -11,6 +11,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "solution_items", "solution_
 		README.md = README.md
 	EndProjectSection
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SharpCalculator.Tests", "SharpCalculator.Tests\SharpCalculator.Tests.csproj", "{E929E48D-D11B-4FB5-AC6F-D0D50E2B3BD1}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -25,5 +27,9 @@ Global
 		{8EA39217-DEBD-493B-A19C-5505B58E03FA}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{8EA39217-DEBD-493B-A19C-5505B58E03FA}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{8EA39217-DEBD-493B-A19C-5505B58E03FA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E929E48D-D11B-4FB5-AC6F-D0D50E2B3BD1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E929E48D-D11B-4FB5-AC6F-D0D50E2B3BD1}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E929E48D-D11B-4FB5-AC6F-D0D50E2B3BD1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E929E48D-D11B-4FB5-AC6F-D0D50E2B3BD1}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal