Link problem with Lesson 5: Switch case

This is a discussion on Link problem with Lesson 5: Switch case within the C++ Programming forums, part of the General Programming Boards category; I have this piece of code, from Lesson 5: Switch case. When I compile it, I get this from VS ...

  1. #1
    C++ SharK The SharK's Avatar
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    Question Link problem with Lesson 5: Switch case

    I have this piece of code, from Lesson 5: Switch case.

    When I compile it, I get this from VS 2005:
    Code:
    1>------ Build started: Project: test, Configuration: Release Win32 ------
    1>Compiling...
    1>test.cpp
    1>Linking...
    1>test.obj : error LNK2001: unresolved external symbol "void __cdecl playmultiplayer(void)" (?playmultiplayer@@YAXXZ)
    1>test.obj : error LNK2001: unresolved external symbol "void __cdecl playgame(void)" (?playgame@@YAXXZ)
    1>test.obj : error LNK2001: unresolved external symbol "void __cdecl loadgame(void)" (?loadgame@@YAXXZ)
    1>test - 4 error(s), 0 warning(s)
    ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
    any suggestions ?
    Studying programming languages,
    you'll ALWAYS be a student ;-)

  2. #2
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    where are those three functions declared? Are they in a library that you failed to include in the project or in another *.cpp file that you didn't add to the project. You have to find out where those functions are and either add the *.cpp or the library. Books often contain code snippets that will not compile and link by themselves.

  3. #3
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    This program will compile, but cannot be run until the undefined functions are given bodies, but it serves as a model (albeit simple) for processing input.
    To link and run you need to fill in the code for those functions.

  4. #4
    C++ SharK The SharK's Avatar
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    Hi Ancient Dragon !

    It say's in the text:
    Below is a sample program, in which not all of the proper functions are actually declared, but which shows how one would use switch in a program.
    Code:
    #include <iostream>
    
    using namespace std;
    
    void playgame();
    void loadgame();
    void playmultiplayer();
    	
    int main()
    {
      int input;
      
      cout<<"1. Play game\n";
      cout<<"2. Load game\n";
      cout<<"3. Play multiplayer\n";
      cout<<"4. Exit\n";
      cout<<"Selection: ";
      cin>> input;
      switch ( input ) {
      case 1:            // Note the colon, not a semicolon
        playgame();
        break;
      case 2:            // Note the colon, not a semicolon
        loadgame();
        break;
      case 3:            // Note the colon, not a semicolon
        playmultiplayer();
        break;
      case 4:            // Note the colon, not a semicolon
        cout<<"Thank you for playing!\n";
        break;
      default:            // Note the colon, not a semicolon
        cout<<"Error, bad input, quitting\n";
        break;
      }
      cin.get();
    }
    Studying programming languages,
    you'll ALWAYS be a student ;-)

  5. #5
    and the hat of wrongness Salem's Avatar
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    > in which not all of the proper functions are actually declared
    This is the key phrase - the program isn't complete.

    > void playgame();
    For these three functions, you need to provide
    Code:
    void playgame() {
      cout << "playgame called\n";
    }
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  6. #6
    C++ SharK The SharK's Avatar
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    Hi Salem


    Yep, that did the trick ;-)

    No body, no function !


    regards,

    The SharK
    Studying programming languages,
    you'll ALWAYS be a student ;-)

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