code stuff

// in file "main.cpp"
#include <iostream>
#include "add.h"

int main()
{
    using namespace std;
    cout << "The sum of 3 and 4 is: " << add(3, 4) << endl;
    return 0;
}


//in file add.cpp
int add(int x, int y)
{
    return x + y;
}


//in file add.h
#ifndef ADD_H
#define ADD_H

int add(int x, int y)

#endif