C++ include and redefinition of class error

Question

I am currently programming a program which searches song according to diffrent parameters. In my system there are 2 types of songs: lyric and instrumetal. Since i need to p

Answer 1

You have to tell preprocessor to include your header files only once. You can achieve by adding #pragma once on the top of all *.h files:

#pragma once

//Your header file's code

It is also a good practice to always begin header files with this line.