Java Examples - factorial
Factorial of a positive integer (English: factorial) are all less than and equal to the product of the number of positive integer, and have the factorial of 0 is 1. Writing a natural number n factorial n !.
I.e., n! = 1 × 2 × 3 × ... × n. Factorial can also recursively defined:! 0 = 1, n = (n-1) × n!!.
The following example demonstrates the implementation of Java factorial code:
/* author by w3cschool.cc MainClass.java */ public class MainClass { public static void main(String args[]) { for (int counter = 0; counter <= 10; counter++){ System.out.printf("%d! = %d\n", counter, factorial(counter)); } } public static long factorial(long number) { if (number <= 1) return 1; else return number * factorial(number - 1); } }
The above code is run output is:
0! = 1 1! = 1 2! = 2 3! = 6 4! = 24 5! = 120 6! = 720 7! = 5040 8! = 40320 9! = 362880 10! = 3628800