How to call functions from one .cpp file in another .cpp file?

Question

I tried looking this up and got mixed results using header files and such.

Basically I have multiple cpp files with all my functions I made for use with binary trees, B

Answer 1

That is quite simple, as JMAA said you should do some research to understand these concepts, but being practical, this is what you would do:

You'll define an functionsExample.cpp where you have to define all your functions and also an functionsExample.h where you'll declare your functions.

You'll have this as the functionsExample.cpp:

#include 
int example(int x, int y)
{
    return x + y;
}

Ans this as functionsExample.h:

#ifndef FUNCTIONSEXAMPLE_H
#define FUNCTIONSEXAMPLE_H

int example(int x, int y);

#endif 

Then in the cpp you want to run the example function, simply add:

#include "functionsExample.h"

But as I said, you should do some research about header guards, preprocessor directives and files organization to have a deeper knowledge about this. Some links I would recommend:

Header Files

Preprocessor Directives