Thread: how to use operator+() in this code?

Hi guys!

I don't know anything about how to use operator+(), I have just searched some sites(tutorial / articles) and have done what they have said, but didn't succeeded in compiling my program.

Here is the code, (commenting the lines used for operator+())

Code:

#include <iostream>
using namespace std;

class math
{
    private:
    int number;

    public:
    math();   //constructor of the class

//    math operator+(math);

math::math()
{
    number = 0;
}

int main()
{
    math obj1, obj2;
//    int a = 10;
//    obj1 = obj2 +a;
    obj1 = obj2 + 10;
}

math math::operator+(math obj)    //Also wrote (math obj, int x) and many other combinations
{
    math temp;
    temp.number = obj.number + 10;
    return (temp);
}

Compiler says that, there is no operator+ for 'obj2 + 10'