Monday, 23 May 2011

java program: factorial using for loop

import java.io.*;

class Loopit {
  public static void main (String[] args) throws IOException {
    BufferedReader stdin = new BufferedReader
      (new InputStreamReader (System.in));
    int count, max, num;
    num = 0; // Assign initial value of count
    while (num != -1) {
      System.out.print ("Enter a number to factorialize (-1 to quit): ");
      System.out.flush();
      num = Integer.parseInt (stdin.readLine());
      max = 1; // Assign to 1, so factorial isn't zero every time
      if (num == -1) {
        System.out.println("Okay, quiting...");
      }
      else { // Since they're not quitting we better factorialize
        for  (count = 1; count<=num; count++) {
          max = count * max;
        }   
        System.out.println (num+"! (factorial) is : "+ max);
      }
    }
  } // method main
}
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