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
![new-windows-store-app.jpg]()
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;
using Windows.UI.Xaml.Navigation;
namespace Strong_Number_app
{
public sealed partial class MainPage : Page
{
public MainPage()
{
this.InitializeComponent();
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
}
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
Now Run your app.
![run-strong-number-app.jpg]()
![output-of-strong-app.jpg]()