Example 1: Find Factorial of a number using for loop
public class Factorial { public static void main(String[] args) { int num = 10; long factorial = 1; for(int i = 1; i <= num; ++i) { // factorial = factorial * i; factorial *= i; } System.out.printf("Factorial of %d = %d", num, factorial); } }
Output
Factorial of 10 = 3628800
Example 2: Find Factorial of a number using BigInteger
import java.math.BigInteger; public class Factorial { public static void main(String[] args) { int num = 30; BigInteger factorial = BigInteger.ONE; for(int i = 1; i <= num; ++i) { // factorial = factorial * i; factorial = factorial.multiply(BigInteger.valueOf(i)); } System.out.printf("Factorial of %d = %d", num, factorial); } }
Output
Factorial of 30 = 265252859812191058636308480000000
Example 3: Find Factorial of a number using while loop
public class Factorial { public static void main(String[] args) { int num = 5, i = 1; long factorial = 1; while(i <= num) { factorial *= i; i++; } System.out.printf("Factorial of %d = %d", num, factorial); } }
Output
Factorial of 5 = 120
