---

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        x:Class="MyAvaloniaApp.MainWindow"
        Title="Калькулятор" Width="250" Height="300">

    <StackPanel Margin="15" Spacing="10">
        <!-- Поле вывода (экран калькулятора) -->
        <TextBox Text="0" FontSize="20" HorizontalContentAlignment="Right" IsReadOnly="True"/>

        <!-- Кнопки калькулятора -->
        <Grid RowDefinitions="*,*,*,*" ColumnDefinitions="*,*,*,*" Height="200">
            <!-- 1 ряд -->
            <Button Grid.Row="0" Grid.Column="0" Content="7" Margin="2"/>
            <Button Grid.Row="0" Grid.Column="1" Content="8" Margin="2"/>
            <Button Grid.Row="0" Grid.Column="2" Content="9" Margin="2"/>
            <Button Grid.Row="0" Grid.Column="3" Content="/" Margin="2"/>

            <!-- 2 ряд -->
            <Button Grid.Row="1" Grid.Column="0" Content="4" Margin="2"/>
            <Button Grid.Row="1" Grid.Column="1" Content="5" Margin="2"/>
            <Button Grid.Row="1" Grid.Column="2" Content="6" Margin="2"/>
            <Button Grid.Row="1" Grid.Column="3" Content="*" Margin="2"/>

            <!-- 3 ряд -->
            <Button Grid.Row="2" Grid.Column="0" Content="1" Margin="2"/>
            <Button Grid.Row="2" Grid.Column="1" Content="2" Margin="2"/>
            <Button Grid.Row="2" Grid.Column="2" Content="3" Margin="2"/>
            <Button Grid.Row="2" Grid.Column="3" Content="-" Margin="2"/>

            <!-- 4 ряд -->
            <Button Grid.Row="3" Grid.Column="0" Content="C" Margin="2"/>
            <Button Grid.Row="3" Grid.Column="1" Content="0" Margin="2"/>
            <Button Grid.Row="3" Grid.Column="2" Content="=" Margin="2"/>
            <Button Grid.Row="3" Grid.Column="3" Content="+" Margin="2"/>
        </Grid>
    </StackPanel>
</Window>