In this article you can learn about Factorial Numbers. So first of all let us understand what a Factorial Number is. Then I will describe Factorial Numbers in programming terms.
Factorial Number
A number is a Factorial Number that is the product of a given positive integer multiplied by all lesser positive integers. The Symbol of Factorial is "!".
Example: Number 5!=5*4*3*2*1
Use the following procedure to create the Factorial app.
Step 1
First of all you have to create a New Windows Store Application.
- 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="Factorial_app.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Factorial_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="37*"/>
<RowDefinition Height="607*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="282*"/>
<ColumnDefinition Width="62*"/>
<ColumnDefinition Width="339*"/>
</Grid.ColumnDefinitions>
<TextBlock Text="Get The Factorial Of Number" FontFamily="Arial" FontSize="15" FontWeight="ExtraBold" Foreground="Red" Grid.ColumnSpan="3" Grid.Row="1" TextAlignment="Center" ></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="Factorial 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" Margin="5,0,661,0" Height="32" VerticalAlignment="Bottom" />
<Button Content="Click" Click="Button1_click" Grid.Column="2" Grid.Row="4" FontSize="15" Foreground="Red" Background="Yellow" Width="137" Height="39" VerticalAlignment="Top" Grid.RowSpan="2" />
</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 Factorial_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 fact = 1;
for (int i = num; i > 0; i--)
{
fact = fact * i;
}
text2.Text = fact.ToString();
}
}
}
Step 4
Now Run Your app.
![run-factorial-app.jpg]()
![output-of-factorial-app.jpg]()