basic-programs/java/recursion/Factorial.java at master · Skm26/basic-programs · GitHub

48 lines (26 loc) · 709 Bytes

import java.util.Scanner;

/**

* Created by buddhimah on 10/16/2017.

public class Factorial {

public static int fac(int num){

int r;

if(num==1){

return 1;

}

r= fac(num-1)*num;

return r;

}

public static void main(String args[]){

Scanner sc = new Scanner(System.in);

System.out.println("Enter a number: ");

int num =sc.nextInt();

if(num<0){

Error a = new Error("factorial for negative numbers is undefined");

System.out.println(a.getMessage());

Factorial.main(new String[1]);

}else {

System.out.println(fac(num));

}

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