wpf-calculator/SimpleCalculator/MainWindow.xaml

<Window x:Class="SimpleCalculator.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:vm="clr-namespace:SimpleCalculator"
        mc:Ignorable="d"
        Title="MainWindow" Height="600" Width="400">
    <Window.Resources>
        <vm:CalculatorMV x:Key="ViewModel" />
    </Window.Resources>
    <Grid DataContext="{StaticResource ViewModel}">
        <Grid.RowDefinitions>
            <RowDefinition Height="2*" />
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <Label
            Grid.Column="0"
            Grid.Row="0"
            Grid.ColumnSpan="4"
            Content="{Binding ResultText}"
            Margin="10"
            BorderBrush="Black"
            BorderThickness="5"
            Background="Green"
            FontSize="56"
            FontFamily="Consolas"
            VerticalContentAlignment="Center"
            HorizontalContentAlignment="Right"
        />
        <Button
            Grid.Column="0"
            Grid.Row="1"
            Grid.ColumnSpan="1"
            Content="AC"
            Style="{StaticResource SpecialButton}"
            Command="{Binding acClickedCommand}"
        />
        <Button
            Grid.Column="1"
            Grid.Row="1"
            Grid.ColumnSpan="1"
            Content="±"
            Style="{StaticResource SpecialButton}"
            Command="{Binding invertClickedCommand}"
        />
        <Button
            Grid.Column="2"
            Grid.Row="1"
            Grid.ColumnSpan="1"
            Content="%"
            Style="{StaticResource SpecialButton}"
            Command="{Binding percentileClickedCommand}"
        />


        <Button
            Grid.Column="3"
            Grid.Row="1"
            Grid.ColumnSpan="1"
            Content="÷"
            Style="{StaticResource OperatorButton}"
            Command="{Binding divideClickedCommand}"
        />
        <Button
            Grid.Column="3"
            Grid.Row="2"
            Grid.ColumnSpan="1"
            Content="×"
            Style="{StaticResource OperatorButton}"
            Command="{Binding multiplyClickedCommand}"
        />
        <Button
            Grid.Column="3"
            Grid.Row="3"
            Grid.ColumnSpan="1"
            Content="-"
            Style="{StaticResource OperatorButton}"
            Command="{Binding subtractClickedCommand}"
        />
        <Button
            Grid.Column="3"
            Grid.Row="4"
            Grid.ColumnSpan="1"
            Content="+"
            Style="{StaticResource OperatorButton}"
            Command="{Binding addClickedCommand}"
        />
        <Button
            Grid.Column="3"
            Grid.Row="5"
            Grid.ColumnSpan="1"
            Content="="
            Style="{StaticResource OperatorButton}"
            Command="{Binding equalClickedCommand}"
        />
        

        <Button
            Grid.Column="0"
            Grid.Row="2"
            Grid.ColumnSpan="1"
            Command="{Binding numberClickedCommand}"
            CommandParameter="7"
            Content="7"
            Style="{StaticResource NumberButton}"
        />
        <Button
            Grid.Column="1"
            Grid.Row="2"
            Grid.ColumnSpan="1"
            Command="{Binding numberClickedCommand}"
            CommandParameter="8"
            Content="8"
            Style="{StaticResource NumberButton}"
        />
        <Button
            Grid.Column="2"
            Grid.Row="2"
            Grid.ColumnSpan="1"
            Command="{Binding numberClickedCommand}"
            CommandParameter="9"
            Content="9"
            Style="{StaticResource NumberButton}"
        />
        <Button
            Grid.Column="0"
            Grid.Row="3"
            Grid.ColumnSpan="1"
            Command="{Binding numberClickedCommand}"
            CommandParameter="4"
            Content="4"
            Style="{StaticResource NumberButton}"
        />
        <Button
            Grid.Column="1"
            Grid.Row="3"
            Grid.ColumnSpan="1"
            Command="{Binding numberClickedCommand}"
            CommandParameter="5"
            Content="5"
            Style="{StaticResource NumberButton}"
        />
        <Button
            Grid.Column="2"
            Grid.Row="3"
            Grid.ColumnSpan="1"
            Command="{Binding numberClickedCommand}"
            CommandParameter="6"
            Content="6"
            Style="{StaticResource NumberButton}"
        />
        <Button
            Grid.Column="0"
            Grid.Row="4"
            Grid.ColumnSpan="1"
            Command="{Binding numberClickedCommand}"
            CommandParameter="1"
            Content="1"
            Style="{StaticResource NumberButton}"
        />
        <Button
            Grid.Column="1"
            Grid.Row="4"
            Grid.ColumnSpan="1"
            Command="{Binding numberClickedCommand}"
            CommandParameter="2"
            Content="2"
            Style="{StaticResource NumberButton}"
        />
        <Button
            Grid.Column="2"
            Grid.Row="4"
            Grid.ColumnSpan="1"
            Command="{Binding numberClickedCommand}"
            CommandParameter="3"
            Content="3"
            Style="{StaticResource NumberButton}"
        />
        <Button
            Grid.Column="0"
            Grid.Row="5"
            Grid.ColumnSpan="2"
            Command="{Binding numberClickedCommand}"
            CommandParameter="0"
            Content="0"
            Style="{StaticResource NumberButton}"
        />
        <Button
            Grid.Column="2"
            Grid.Row="5"
            Grid.ColumnSpan="1"
            Content=","
            Style="{StaticResource NumberButton}"
            Command="{Binding decimalPointClickedCommand}"
        />
    </Grid>
</Window>