Java Example - Factorial

The factorial (English: factorial) of a positive integer is the product of all positive integers less than and equal to the number, and the factorial of 0 is 1. The factorial of a natural number n is written n!.

That is, n!=1×2×3×...×n. Factorial can also be defined recursively: 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 output result of running the above code is:

0! = 1
1! = 1
2! = 2
3! = 6
4! = 24
5! = 120
6! = 720
7! = 5040
8! = 40320
9! = 362880
10! = 3628800

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