Loops.java

import java.io.*;
import java.util.*;

public class Loops {

    public int fact(int n){
	if (n==1 || n==0){
	    return 1;
	}
	else if (n<0) {
	    return -1;
	}
	else {
	    return n*fact(n-1);
	}
    }

    public int fact2(int n){
	int prod = 1;

	while (n>1){
	    prod = n * prod;
	    n = n-1;
	}
	if (n < 0){
	    return -1;
	}
	else {
	    return prod;
		}
    }
}