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Factorial.java
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48 lines (26 loc) · 709 Bytes
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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));
}
}
}