Making a Calculator in Windows Store Apps

Introduction

Today we are creating a simple calculator Windows Store App using C# and XAML in Visual Studio 2012. This calculator app will simply perform addition, subtraction, multiplication, division and percentage calculation like the Windows Calculator but not like the scientific calculator.

Step 1

The first step is to create a new Windows Store App.

Step 2

In the second step double-click on "MainPage.xaml":

Step 3

The "MainPage.xaml" is as in the follwoing code:

<Page

x:Class="App2.MainPage"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:local="using:App2"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

mc:Ignorable="d">

</Grid>

</Page>

Step 4

The "MainPage.xaml.cs" is as in the following code:

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using Windows.Foundation;

using Windows.Foundation.Collections;

using Windows.UI.Xaml;

using Windows.UI.Xaml.Controls;

using Windows.UI.Xaml.Controls.Primitives;

using Windows.UI.Xaml.Data;

using Windows.UI.Xaml.Input;

using Windows.UI.Xaml.Media;

using Windows.UI.Xaml.Navigation;

namespace App2

{

public sealed partial class MainPage : Page

{

public MainPage()

{

this.InitializeComponent();

}

protected override void OnNavigatedTo(NavigationEventArgs e)

{

ValuText.IsReadOnly = true;

}

string opration;

double num1, num2, result;

private void Btn1_Click(object sender, RoutedEventArgs e)

{

TextBox.Text = TextBox.Text + "1";

}

private void Btn2_Click(object sender, RoutedEventArgs e)

{

TextBox.Text = TextBox.Text + "2";

}

private void Btn3_Click(object sender, RoutedEventArgs e)

{

TextBox.Text = TextBox.Text + "3";

}

private void Btn4_Click(object sender, RoutedEventArgs e)

{

TextBox.Text = TextBox.Text + "4";

}

private void Btn5_Click(object sender, RoutedEventArgs e)

{

TextBox.Text = TextBox.Text + "5";

}

private void Btn6_Click(object sender, RoutedEventArgs e)

{

TextBox.Text = TextBox.Text + "6";

}

private void Btn7_Click(object sender, RoutedEventArgs e)

{

TextBox.Text = TextBox.Text + "7";

}

private void Btn8_Click(object sender, RoutedEventArgs e)

{

TextBox.Text = TextBox.Text + "8";

}

private void Btn9_Click(object sender, RoutedEventArgs e)

{

TextBox.Text = TextBox.Text + "9";

}

private void Btn0_Click(object sender, RoutedEventArgs e)

{

TextBox.Text = TextBox.Text + "0";

}

private void BtnDot_Click(object sender, RoutedEventArgs e)

{

if(TextBox.Text.Contains("."))

{

TextBox.Text=TextBox.Text;

}

else

{

TextBox.Text=TextBox.Text+".";

}

private void BtnPlus_Click(object sender, RoutedEventArgs e)

{

if (TextBox.Text.Length > 0)

{

num1 = double.Parse(TextBox.Text);

opration = "+";

TextBox.Text = "";

ValuText.Text = num1 + "+";

}

private void BtnMinus_Click(object sender, RoutedEventArgs e)

{

if (TextBox.Text.Length > 0)

{

num1 = double.Parse(TextBox.Text);

opration = "-";

TextBox.Text = "";

ValuText.Text = num1 + "-";

}

private void BtnMulti_Click(object sender, RoutedEventArgs e)

{

if (TextBox.Text.Length > 0)

{

num1 = double.Parse(TextBox.Text);

opration = "*";

TextBox.Text = "";

ValuText.Text = num1 + "*";

}

private void BtnDiv_Click(object sender, RoutedEventArgs e)

{

if (TextBox.Text.Length > 0)

{

num1 = double.Parse(TextBox.Text);

opration = "/";

TextBox.Text = "";

ValuText.Text = num1 + "/";

}

private void BtnPer_Click(object sender, RoutedEventArgs e)

{

if (TextBox.Text.Length > 0)

{

num1 = double.Parse(TextBox.Text);

opration = "%";

TextBox.Text = "";

ValuText.Text = num1 + "%";

}

private void BtnCan_Click(object sender, RoutedEventArgs e)

{

int length = TextBox.Text.Length;

if (length > 0)

{

TextBox.Text = TextBox.Text.Remove(length - 1);

}

else

{

TextBox.Text = TextBox.Text;

}

private void Button_Click_1(object sender, RoutedEventArgs e)

{

TextBox.Text = "";

ValuText.Text = "";

}

private void BtnEqual_Click(object sender, RoutedEventArgs e)

{

if (TextBox.Text.Length > 0)

{

num2 = double.Parse(TextBox.Text);

ValuText.Text = "";

switch (opration)

{

case "+":

result = num1 + num2;

TextBox.Text = result.ToString();

break;

case "-":

result = num1 - num2;

TextBox.Text = result.ToString();

break;

case "*":

result = num1 * num2;

TextBox.Text = result.ToString();

break;

case "/":

if (num2 == 0)

{

ValuText.Text = "Cannot divide by zero";

break;

}

else

{

result = num1 / num2;

TextBox.Text = result.ToString();

break;

}

case "%":

num1 = num1 * num2;

result = num1 / 100;

TextBox.Text = result.ToString();

break;

}

Step 5

After running the program the output will look as in the following: