How to properly name include guards in c++

Question

I have 3 header files:

misc.h
MyForm.h
Registration.h

In misc.h file I put

#ifndef MISC_H
#define MISC_H
#endif

Answer 1

You need to put individual include guards in every header, notably in MyForm.h:

#ifndef MYFORM_H
#define MYFORM_H
#include "misc.h"
#include "Registration.h"
// etc...
#endif /*MYFORM_H*/

and in Registration.h:

#ifndef REGISTRATION_H
#define REGISTRATION_H
// actual code
// etc...
#endif /*REGISTRATION_H*/