我怎样才能得到这个输出？

Question

 import java.util.Scanner; public class EuclidGCD { public static void main(String[] args) { Scanner kbd = new Scanner (System.in); System.out.print ("Enter First Number: "); int n1 = kbd.nextInt(); System.out.print ("Enter Second Number: "); int n2 = kbd.nextInt(); int gcd = 1; int k = 2; while (k <= n1 && k <= n2){ if (n1 % k == 0 && n2 % k == 0) gcd = k ; k ++; } System.out.println("The GCD of " + n1 + " and " + n2 + " is " + gcd); } } 

so everything works but I realized that I do not want a neg number if a negative number is entered I want the output POSITIVE NUMBERS ONLY so would I need another while loop?

Answer 1

Just add a if statement checking if n1 and n2 are positive, and only excuted the rest of your code if they are. You shouldn't need another while loop

public static void main(String[] args) {
        Scanner kbd = new Scanner (System.in);
        System.out.print ("Enter First Number: ");
        int n1 = kbd.nextInt();
        System.out.print ("Enter Second Number: ");
        int n2 = kbd.nextInt();
        if(n1 < 0 || n2 < 0 ){
            System.out.println("POSITIVE NUMBERS ONLY ");

        }else{
            int gcd = 1;
            int k = 2;
            while (k <= n1 && k <= n2){
                if (n1 % k == 0 && n2 % k == 0)
                gcd = k ;
            k ++;
            }
            System.out.println("The GCD of " + n1 + " and " + n2 + " is " + gcd);
        }
    }