Program to calculate Factorial of a number in Java

September 29, 2014 , 0 Comments

This java program finds factorial of a number. Entered number is checked first if its negative then an error message is printed.

import java.util.Scanner;

class Factorial
{
   public static void main(String args[])
   {
      int n, c, fact = 1;

      System.out.println("Enter an integer to calculate it's factorial");
      Scanner in = new Scanner(System.in);

      n = in.nextInt();

      if ( n < 0 )
         System.out.println("Number should be non-negative.");
      else
      {
         for ( c = 1 ; c <= n ; c++ )
            fact = fact*c;

         System.out.println("Factorial of "+n+" is = "+fact);
      }
   }
}

Factorial of a number in Java

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Prakash Hari Sharma
I'm a software developer and Java enthusiast. I like clean and modular code, enjoy Agile projects and have a passion for trying out new things. I try to learn and teach every day, and occasionally I'm even able to blog about it. :)