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Java Program to Find a Factorial of a Number

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In this example, we will calculate the factorial of a number taking the value from the user. You may also learn to find Factorial of a Number in Java Using recursion.

Before we begin, you should have the knowledge of the following:

Factorial of n number: Factorial of n number is the product of all the positive descending integers and is denoted by n!.

Example:

factorial of n (n!) = n * (n-1) * (n-2) * (n-3)….1
factorial of 5 (n!) = 5 * 4 * 3 * 2 * 1
NOTE: Factorial of 0 (0!) = 1

Java Program to Find a Factorial of a Number Using for loop.

 //find the factorial of a number in java

 import java.util.Scanner;

 public class FactorialOfANumber
 {
  public static void main(String args[])
  {
    int fact=1;
    Scanner scanner = new Scanner(System.in);

    System.out.print("Enter the number: ");
    int num = scanner.nextInt();

    for(int i=1;i<=num;i++)
    {
     fact = fact * i;
    }
    System.out.println("Factorial of entered number is: "+fact);
  }

 }

Output:

Enter the number: 5
Factorial of entered number is: 120

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