Factorial program in Java

In this article we will learn about Factorial program in Java.

Factorial Program : The factorial of n is denoted by n! and calculated by the integer numbers from 1 to n.

Example
5!=5*4*3*2*1=120
4! = 4*3*2*1=24

Factorial program in Java

Find Factorial of a number using for loop.

import java.util.Scanner;

class FacorialProgramExample
{
  public static void main(String args[])
  {
    int num,fact=1;
    Scanner sc=new Scanner(System.in);
    System.out.println("Enter an Integer number:");
    //The input provided by user is stored in num
    num=sc.nextInt();
     
    for(int i=1;i<=num;i++){
       fact=fact*i;
      
   }
    System.out.print("Factorial of "+num+" is = " +fact);
  }
}

Output for Factorial program in Java

Example 2: Find Factorial of a number using while loop

import java.util.Scanner;

class FacorialProgramExample
{
  public static void main(String args[])
  {
    int num,fact=1,i=1;
    Scanner sc=new Scanner(System.in);
    System.out.println("Enter an Integer number:");
    //The input provided by user is stored in num
    num=sc.nextInt();
     while(i <= num)
        {
           fact=fact*i;
           i++;
        }
System.out.print("Factorial of "+num+" is = " +fact);
  }
}

Output