C#辗转相除法输出最大公约数

void main() {
    int r, m, n, t;
    scanf_s("%d\n%d", &m, &n);
    if (m < n) {
        t = m;
        m = n;
        n = t;
    }
    while (2) {
        r = m % n;
        if (r == 0) {
            printf("%d", n);
            break;
        }
        m = n;
        n = r;
    }
}