What can i do for add functions by using files .h and .cpp?

Question

code:
source file

include <iostream>
include"calc.h"
using namespace std;

int main (){
calc ();
return 0;
}

.h header
#ifndef calc_h
#define calc_h
class functions {
public:
int calc ();
};
#endif//calc_h

.cpp function contains

#include "calc.h"
#include <iostream>
using namespace std;

int main (){
class functions {
public:
int calc (){
cout <<"hi"<<endl;
};
}

Answer 1

First of all, because your function does not return something it gets void instead of int.

then the ".h" file is your template for your class.
here you define the structure of your class.
therefore all things you defined here goes out of your class. cpp

in the class.cpp after your using namespace
comes your function:
void functions::calc()
{
cout....
}

in your source is missing

functions MyCalc;
MyCalc.calc();

that should work then

Answer 2

thanks it s usseful to know what i did wrong

Answer 3

np... only additional Info.
if you want to pass values into your class you have to do:
in your ".h"
void calc(int);

in your ".cpp"
void functions::calc(int x)
{
cout << 10*x << endl;

in your source
MyCalc.calc(5);

Answer 4

and if i have
a lot of variables in my function
??

Answer 5

You can send aß much vars to your function as you need.
But i have to admit, i never tried to get more than one result back from a function. But i would suggest that it's not possible because of your return Statement whats defined at the beginning of your function