Home/ Questions/What is the error: ‘string’ does not name a type in c++ problem, and how to solve it?
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Paul Roche
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Asked: 2022-05-18T10:51:58+00:00 In:

What is the error: ‘string’ does not name a type in c++ problem, and how to solve it?

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How to solve the problem – error: ‘string’ does not name a type in c++? I have the sample detail:

#include <iostream>
 #include <string>
 #include <sstream>
 #include "game.h"
 #include "board.h"
 #include "piece.h"
 
 using namespace std;

#ifndef GAME_H
 #define GAME_H
 #include <string>
 
 class Game
 {
  private:
  string white;
  string black;
  string title;
  public:
  Game(istream&, ostream&);
  void display(colour, short);
 };
 
 #endif

While I was running it, I found the warning message:

game.h:8 error: 'string' does not name a type
  game.h:9 error: 'string' does not name a type

That is my question in my midterm exam, and it is urgent. I searched the solutions on some websites, but I didn’t get it. I may miss any line or other changes. I appreciate your assistance!

string does not name a type in c++
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2 Answers

  1. Best Answer
    Expert

    The cause:

    game.cpp is the place of your using declaration, but is not game.h which you actually declare string variable declarations. Looks like you want to put using namespace std; in the header above string lines. This will allow those lines to find the string type that is defined in the std namespace.

    Others have already pointed out that and this is bad practice in headings because everyone who includes that header involuntarily hits the using line, and then imports std into their own namespace. Therefore, the error occurs.

    Solution:

    To solve this error, you need to replace those lines with std::string.

    • 7

  2. string doesn’t name any type. std::string is the class name for the class listed in string‘s header.

    Please Do not place using namespace std into a header file. It pollutes all users of the header’s global namespace. Also see “Why is ‘using the namespace std’ considered a bad practice for C++?” ”

    This is how your class should look: 

    #include <string>

class Game
{
 private:
 std::string white;
 std::string black;
 std::string title;
 public:
 Game(std::istream&, std::ostream&);
 void display(colour, short);
};
    • 6

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