Greatest Common Divisor Program in Java

the greatest common divisor (gcd) of two or more integers, which are not all zero, is the largest positive integer that divides each of the integers. For example, the gcd of 8 and 12 is 4.

import java.util.Scanner;

public class GCDProgram
{
    public static void main(String[] args)
    {
        int a, b, gcd = 1;
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a=");
        a = sc.nextInt();
        System.out.print("Enter b=");
        b = sc.nextInt();
        int min, max;
        min = a;
        if (min > b)
        {
            min = b;
            max = a;
        }
        else
        {
            min = a;
            max = b;
        }
        while (max > min)
        {
            int r = max % min;
            if (r == 0)
            {
                gcd = min;
                break;
            }
            else
            {
                max = min;
                min = r;
            }
        }
        System.out.println("GCD=" + gcd);
    }
}

Output:

Enter a=15
Enter b=18
GCD=3