In this C# program, we will learn how to write a program to print factorial of a number.

In mathematics, the factorial of a positive integer *n*, denoted by *n*!, is the product of all positive integers less than or equal to *n*:

n!=(n-1)x(n-2)x(n-3)x….3x2x1

The factorial, symbolized by an exclamation mark (!), is a quantity defined for all integers greater than or equal to 0.

For example,

5!=5x4x3x2x1=120

6!=6x5x4x3x2x1=720

The value of 0! is 1.

Here is the code of the program to print factorial of a number:

```
using System;
namespace TutorialsrackPrograms
{
class Program
{
//c# program to print factorial of a number.
static void Main(string[] args)
{
int i, fact = 1, number;
Console.Write("Enter any Number: ");
number = int.Parse(Console.ReadLine());
for (i = 1; i <= number; i++)
{
fact = fact * i;
}
Console.Write("Factorial of " + number + " is: " + fact);
Console.Read();
}
}
}
```

Enter any Number: 5

Factorial of 5 is: 120

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