下面C++代码实现了欧几里得算法，选出说法错误的选项：

int gcd1(int a, int b) {
    return b == 0 ? a : gcd1(b, a % b);
}
int gcd2(int a, int b) {
    while (b != 0) {
        int temp = b;
        b = a % b;
        a = temp;
    }
    return a;
}