Calculate the greatest common divisor of two given numbers

gcd.c

/* Calculate the greatest common divisor of two given numbers */

#include <stdio.h>

int gcd(int a, int b) {

    int r;
    while (b > 0) {
        r = a % b;
        a = b;
        b = r;
    }
    return a;
}

int main() {

        int x, y;
        while (scanf("%d %d", &x, &y) != EOF) {
            if (x > 0 && y > 0){
                printf("%d %d %d\n", x, y, gcd(x, y));
            }
        }
}