# Strong Number in Windows Store App

First of all let us understand what a Strong Number is. A number is called a Strong Number if the sum of the factorials of each of its digits is equal to the number itself. In other words, the sum of the factorials of digits of a number is equal to the original number.

Example: Number 145=1!+4!+5!

In this article I explain how to create a Strong Number application in a Windows Store app.

Use the following procedure to create the Strong Number app.

Step 1

First you must create a New Window Store Application, as in:

• Open Visual Studio 2012
• "File" -> "New" -> "Project..."
• Choose Template: "Visual C#" -> "Window Store app"
• "Blank App (XAML)", then rename the application

Step 2

Write the following XAML code in "Mainpage.Xaml" (that is available in Solution Explorer):

<Page

x:Class="Strong_Number_app.MainPage"

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

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

xmlns:local="using:armstrong_app"

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

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

mc:Ignorable="d">

<Grid Background="Blue">

<Grid.RowDefinitions>

<RowDefinition Height="38*"/>

<RowDefinition Height="23*"/>

<RowDefinition Height="31*"/>

<RowDefinition Height="32*"/>

<RowDefinition Height="63*"/>

<RowDefinition Height="581*"/>

</Grid.RowDefinitions>

<Grid.ColumnDefinitions>

<ColumnDefinition Width="161*"/>

<ColumnDefinition Width="303*"/>

<ColumnDefinition Width="902*"/>

</Grid.ColumnDefinitions>

<TextBlock Text="Check Number is Strong Number or not" FontFamily="Arial" FontSize="14" FontWeight="ExtraBold" Foreground="Red" Grid.Column="1" Grid.Row="1" Grid.ColumnSpan="2"></TextBlock>

<TextBlock Text="Enter Number:" FontFamily="Arial" FontSize="15" FontWeight="ExtraBold" Foreground="Red" Grid.Column="1" Grid.Row="2"></TextBlock>

<TextBox x:Name="Textbox1" Width="150" Height="32" VerticalAlignment="Top" Grid.Column="2" Grid.Row="2" HorizontalAlignment="Left" Grid.RowSpan="2" />

<TextBlock Text="Number is:" FontFamily="Arial" FontSize="15" FontWeight="ExtraBold" Foreground="Red" Grid.Column="1" Grid.Row="3"></TextBlock>

<TextBlock x:Name="text2" FontFamily="Arial" FontSize="15" FontWeight="ExtraBold" Foreground="Red" Grid.Column="2" Grid.Row="3"></TextBlock>

<Button Content="Click" Click="Button1_click" Grid.Column="2" Grid.Row="4" FontSize="15" Foreground="Red" Background="Yellow" Width="137" Height="38" Margin="0,15,0,10" ></Button>

</Grid>

</Page>

Step 3

Now write the following C# code for the button within "Mainpage.Xaml.cs":

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;

namespace Strong_Number_app

{

public sealed partial class MainPage : Page

{

public MainPage()

{

this.InitializeComponent();

}

{

}

private void Button1_click(object sender, RoutedEventArgs e)

{

int num = Convert.ToInt32(Textbox1.Text);

int sum = 0, num1;

num1 = num;

while (num>0)

{

int fact = 1;

int r=num %10;

for (int j = 1; j <= r; j++)

{

fact = fact * j;

}

sum = sum + fact;

num = num / 10;

}

if (sum == num1)

{

text2.Text = "Strong Number";

}

else

{

text2.Text = "Not Strong Number";

}

}

}

}

Step 4