Java Program to Find Factorial of a Number

In this tutorial, we will learn how to write a Java program to find the factorial of a number.
Factorial of n is the product of all positive descending integers. Factorial of n is denoted by n!.
For example:
4! = 4*3*2*1 = 24 5! = 5*4*3*2*1 = 120

Java Program to Find Factorial of a Number

In the below program, we are using a Scanner to get input from the console.
import java.math.BigInteger; import java.util.Scanner; public class FactorialExample { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("Enter a number: "); int n = scanner.nextInt(); BigInteger fact = factorial(n); System.out.printf("%d! is %d", n, fact); scanner.close(); } private static BigInteger factorial(int value) { BigInteger result = BigInteger.ONE; if (value != 0 && value != 1) { for (int i = 2; i <= value; i++) { result = result.multiply(BigInteger.valueOf(i)); } } return result; } }
Output:
Enter a number: 5 5! is 120

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