C++ :: Perform Subtraction Between Two Objects And Put Result In Third Object

trying to understand operator overloading, and i wrote some code just to define a "-" operator to do a simple subtraction. SO, i wrote a program that can perform a subtraction between two objects and put the result in the third object. now I Just cant show the result on the console. And also can anyone define the meaning of [b1.x], like I want to know am I assigning the value to the "b1"object or the x variable? This is a very concept that I need to understand.

#include<iostream>
using namespace std;
struct Ok
{
int x;
int y;
};

Ok operator-(const Ok& a , const Ok& b)

{
Ok result;
result = (a - b);
return result;
}
int main()

[Code]...