Question

This is my code:

• mainheader.h

  void displaygrid(int (* _grid)[10][10] , string msg );
  

• something.cpp

  #include <string>
  #include "mainheader.h"
  
  void displaygrid(int (* _grid)[10][10], string msg = "" )
  {
     //body goes here
  }
  

Compiler says at line of forward declaration in header:

_grid and string are undeclared identifiers

however since its just prototype, it shouldnt be worried about existence of _grid, right ?

Also, header is included after the string , but it doesnt know about string as well. It looks like its trying to call function instead of forward declaring. What’s wrong?

Answer 1

For string you have to use std::string.