Simple program written in Java to calculate integer factorial.

package factorial;

import java.util.Scanner;

// ? 2017 TheFlyingKeyboard 
// theflyingkeyboard.net

public class Factorial{
  public static void main(String []args) {
    Scanner reader = new Scanner(System.in);
    int n; 	
    
    System.out.println("Enter a number: ");
    n = reader.nextInt(); //Reads integer from keyboard			
    
    System.out.println("Factorial of: " + n + " is equal to: " + factorial(n));
  }
  
  public static int factorial(int n){
    int fact = 1;
    
    for(int i = 2; i <= n; i++){
      fact *= i;
    }
    
    return fact;
  }
}

 



Java Int Factorial
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