#include <iostream>
using std::cout;
using std::endl;
class A {
private:
int a;
int b;
public:
A(int a, int b) {
if (a < 0) {
std::cout<<"a값 입력 오류"<<std::endl;
return;
}
this->a = a;
this->b = b;
}
int getA() {
return a;
}
int getB() {
return b;
}
};
int main() {
A a(-1, 0);
std::
