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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | //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