FOR NICK

 import java.util.Scanner;
   class Problem1{
      public static void main( String[] args ){
         Scanner sc = new Scanner(System.in);
         int num1;
         int num2;
         int dividend = 0;
         int divisor = 0;
         int remainder = 0;
         int remainder1 = 0;
         int check1;
         int check2;


         do {
             System.out.println("Enter a positive integer: ");
             while (!sc.hasNextInt()) {
                 System.out.println("Please enter a positive integer:");
                 sc.next();
             }
             num1 = sc.nextInt();

         } while (num1 <= 0);
         {
             do {
                 System.out.println("Enter a positive integer: ");
                 while (!sc.hasNextInt()) {
                     System.out.println("Please enter another positive integer:");
                     sc.next();
                 }
                 num2 = sc.nextInt();

             } while (num2 <= 0);
             {

         }

         if(num1 > num2){
             dividend = num1;
             divisor = num2;
             remainder = num1 % num2;
             if (remainder == 0){
                System.out.println("The GCD of " + num1 + " and " + num2 + " is " + num2);
                System.exit(0);
             }
         } else if(num2 > num1) {
             divisor = num1;
             dividend = num2;
             remainder = num2 % num1;
             if (remainder == 0){
                System.out.println("The GCD of " + num1 + " and " + num2 + " is " + num1);
                System.exit(0);
             }
         }else if(num2 == num1) {
            System.out.println("The GCD of " + num1 + " and " + num2 + " is " + num1);
            System.exit(0);
         }
         while(remainder > 0){
             dividend = divisor;
             divisor = remainder;
             remainder1 = remainder;
             remainder = dividend % divisor;

         }
         System.out.println("The GCD of " + num1 + " and " + num2 + " is " + remainder1);
      }
   }
   }