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

Declare functions in a header

//MyFunctions.h
int myFunction1(int,int);
int myFunction2(int,int);

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Implement them in MyFunctions.cpp

//MyFunctions.cpp
#include "MyFunctions.h"
int myFunction1(int a, int b){
    //your code
}
int myFunction2(int a, int b){
    //your code
}

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Include the header in whatever file you want

//OtherFile.cpp
#include "MyFunctions.h"
//Now you have access to the functions defined in MyFunctions.h in this file

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I dont know miniGW but it should look something like g++ otherfile.cpp MyFunctions.cpp ...