Single class has a Class Redefinition Error

Question

I\'m new to C++, and I\'m having a problem with my class definitions in a header file. The code for the header file (Student.h) is:

#include 
u         


        

Answer 1

When I learnt c++ our professor said, the first two lines that you write in c++ class should always be #ifndef followed by #define. This prevents multiple definitions in header files

http://www.fredosaurus.com/notes-cpp/preprocessor/ifdef.html