operator overloading C++

Question

#include <iostream>
using namespace std;

class MyClass {
public:
int var;
MyClass() { }
MyClass(int a)
: var(a) { }

MyClass operator+(MyClass &obj) {
MyClass res;
res.var= this->var+obj.var;
return res;
}
};

int main() {
MyClass obj1(12), obj2(55);
MyClass res = obj1+obj2;

cout << res.var;
}

Please helppp. Why missing the “MyClass() { }”in line 7 will cause error??

Answer 1

Why is it required🤔Does it have any special meaning?

Answer 2

Thx~