C++ MVC example

I'm calling this a MVC example for simplicity. It's actually separating 3 c++ files into 3 different responsibility for better organization and reuse-ability.

coordin.h
This is the header file which contain templates and functions prototype. This file will be included on the other 2 files.

#ifndef COORDIN_H_
#define COORDIN_H_

//structur templates
struct polar{
    char from[50];    //distance from origin
    char description[50];       //direction from origin
};

//prototype
int balls(polar test);

#endif

file2.cpp
This file contain functions called in file1.cpp

# include <iostream>
# include <cmath>
# include "coordin.h" //structure templates, function prototype, what links the scripts

//convert rectagular to polar coordinates
using namespace std;
int balls(polar test){
    cout << test.description << endl << test.from << endl ;
}

file1.cpp
This file is where you put the meat of your program. This is where you bring all the previous files together.

#include <iostream>
#include "coordin.h" // structure templates, function prototypes.  what links the scripts
using namespace std;

int main(){
    polar test = {"mvc like","must compile both file1 and file2"};

    balls(test);

    return 0;
}

Now in order for this to work you must compile both file1.ccp and file2.cpp at the same time. Example:
$ g++ file1.cpp file2.cpp