# C# Program to find Factorial of a Number

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## What is Factorial of a Number?

The factorial of a number n can be defined as the product of all positive numbers less than or equal to n. For example, the factorial of 6 is 1 × 2 × 3 × 4 × 5 × 6 = 720.

## Examples

The following table provides few examples of factorial of a number.

NumberFactorialResult
1!11
2!1 × 22
3!1 × 2 × 36
4!1 × 2 × 3 × 424

Note: In Mathematics, factorial of a number is represented by exclamation mark.

Tips: It is recommended to use our online Factorial of a Number calculator for better understanding.

## Find a Factorial of a Number

In the following example, we will find a factorial of a number 6.

### Example

C# Compiler
using System; namespace myApp { class Program { static void Main(string[] args) { int num = 6; int i = 1; int factorial = 1; for(i=1; i<=num; i++) factorial *= i; if(num > 0) Console.Write("Factorial of {0}: {1}", num, factorial); else Console.Write("Factorial of 0: 0"); } } }

### Output

Factorial of 6: 720

## Find a Factorial of any Given Number

In the following example, we will find a factorial of any given number.

### Example

C# Compiler
using System; namespace myApp { class Program { static void Main(string[] args) { int i = 1; int factorial = 1; Console.Write("Enter a (int) number: "); int num = Convert.ToInt32(Console.ReadLine()); for(i=1; i<=num; i++) factorial *= i; if(num > 0) Console.Write("Factorial of {0}: {1}", num, factorial); else Console.Write("Factorial of 0: 0"); } } }

### Output

Enter a (int) number: 4 Factorial of 4: 24

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