Java Examples: May 2014

Question:

How to print out a factorial.

8! should print out:
1, 2, 6, 24, 120, 720, 5040, 40320.

Code:

import java.util.*; 
 
public class Factorial {
   public static void main(String args[]) {
      Scanner sc = new Scanner(System.in);
 
      System.out.print("Please enter a number: "); 
      int number = sc.nextInt();
 
      System.out.print("1");
      for(int i=2;i<=number;i++){
         System.out.print( ", " + fact(i));
      }
      System.out.println(".");
   }
 
   static int fact(int b) {
      if(b <= 1) {
         return 1;
      } else {
         return b * fact(b-1);
      }
   }
}

Output:

$ java Factorial
Please enter a number: 8
1, 2, 6, 24, 120, 720, 5040, 40320.