Hey guys, just wanted to drop in a very simple app which I have made for you, seeing the fact that we have enough information already till now to actually combine all our skills we have learned till now and build an app.

It is just a very simple calculator which I have built for you guys to kinda refresh up your mind to what we have covered till now.

Suggested Reading :

• Beginner’s Guide to Windows Phone 7 App development
• Create Hello World Application in Windows Phone 7
• Different properties of Windows Phone 7 emulator
• Coding the Hello World Application in Windows  Phone 7
• How files interact in Windows Phone 7 App development
• Declaring Variables in Windows Phone Application Development
• Accepting input & displaying it in Windows Phone Application Development
• Using If  Else Statement in Windows Phone 7 App Development

Do take a look and you are welcome to make your own improvements to the code and design, which would be really good for you.

1. Now as we know, there are the four basic operations that a calculator can do- add, subtract, multiply and divide. Just to make things interesting and improve the functionality a little bit, I have used the modulus operation too.

2. As I said, it is a really simple code and design, you should not have any problems building this app, but let me assure you that if you do this successfully. it is going to give a major boost to your confidence.

3. The design of the app will be something like this-

I have used a symbol (i.e. +,-,/,* and %) to represent each of the operations. Now do take in note that the symbols each consist of a button each, so that makes it 5 buttons which I have imported from the ToolBox. Each is going to perform a unique operation.

4. When this is done, double click each of the buttons and write down the code as shown below (I have shown you the whole app code, try figuring out which one belongs to which button)-

using System;
usingSystem.Collections.Generic;
usingSystem.Linq;
using System.Net;
usingSystem.Windows;
usingSystem.Windows.Controls;
usingSystem.Windows.Documents;
usingSystem.Windows.Input;
usingSystem.Windows.Media;
usingSystem.Windows.Media.Animation;
usingSystem.Windows.Shapes;
usingMicrosoft.Phone.Controls;

namespace Variables
{
public partial class MainPage : PhoneApplicationPage
{
// Constructor
publicMainPage()
{
InitializeComponent();
}

private void button1_Click(object sender, RoutedEventArgs e)
{
int val1 = 0;
int val2 = 0;

val1 = int.Parse(textBox1.Text);
val2 = int.Parse(textBox2.Text);

textBlock1.Text = (val1 + val2).ToString();
}

private void button2_Click(object sender, RoutedEventArgs e)
{
int val1 = 0;
int val2 = 0;

val1 = int.Parse(textBox1.Text);
val2 = int.Parse(textBox2.Text);
textBlock1.Text = (val1 – val2).ToString();
}

private void button3_Click(object sender, RoutedEventArgs e)
{
int val1 = 0;
int val2 = 0;

val1 = int.Parse(textBox1.Text);
val2 = int.Parse(textBox2.Text);
textBlock1.Text = (val1 / val2).ToString();
}

private void button4_Click(object sender, RoutedEventArgs e)
{
int val1 = 0;
int val2 = 0;

val1 = int.Parse(textBox1.Text);
val2 = int.Parse(textBox2.Text);
textBlock1.Text = (val1 * val2).ToString();
}

private void button5_Click(object sender, RoutedEventArgs e)
{
int val1 = 0;
int val2 = 0;

val1 = int.Parse(textBox1.Text);
val2 = int.Parse(textBox2.Text);
textBlock1.Text = (val1 % val2).ToString();
}

}
}

5. Do note that I have used Parse() in order to convert the int to a String data-type explicitly, as the int data-type cannot be converted to String, which is the native data-type that the textBox can get as input and the textBlock can display.

6. When I run this code this will give us an output which looks like this-

This should give the correct output for each of the button symbols pressed. So try doing the other buttons and happy coding!

Achievement-use this calculator for your daily simple calculation needs and you will be really satisfied.