Operator Overloading doubt

Question

Can anyone dry run and explain how two objects are passed as parameters and how the value of var and obj.var differs

#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;
}

Answer 1

Compiler "translate" obj1+obj2 statement in

obj1.operator+(obj2)

if this is what want know

Answer 2

KrOW I don't understand how the two numbers are passed, how does var become 12 and obj.var become 55, are they passed together or separately

Answer 3

Praful M Thanks to constructor

MyClass(int a):var(a){}

This copy argument ('a') value to class 'var' attribute