undefined reference error beginner here

Question

I'm new to C++ and and I've been trying to solve this problem. I've copied it form a book and I'm using code-blocks and my IDE but I don't understand why this is not working. I have looked around for answers and somebody said

undefined reference error, usually it's because the .o file (which gets created from the .cpp file) doesn't exist

But when I checked the files it was there. If someone could help it would be greatly appreciated. I also think that part of the problem could be something to do with the binary scope resolution operator. Here's my code:

    **gradebook.h**
    #include <string>
    using namespace std;
    class gradebook
    {
    public:
    gradebook ( string );
    void setcourseName( string );
    string getcourseName();
    void displayMessage();
    private:
    string courseName;
    };//end gradebook.h


    **gradebook.cpp**
    #include <iostream>
    #include "gradebook.h"
    using namespace std;
    gradebook::gradebook(string name){
    setcourseName(name);
    }
    void gradebook::setcourseName(string name){
    courseName = name;
    }
    string gradebook::getcouseName(){
    return courseName;
    }
    void gradebook::displayMessage(){
    cout<<"welcome to the grade book for\n" << getcourseName()<<"!"<<endl;                  
    }//end gradebook.cpp 


    **main.cpp**
    #include <iostream>
    #include "gradebook.h"
    using namespace std;
    int main()
    {
    gradebook gradebook1("CS101 introduction to c++ programing");
    gradebook gradebook2("CS102 data structures in c++");

    cout<< "gradebook1 created for course:" << gradebook1.getcourseName()
    << "\n gradebook2 created for course:" <<gradebook2.getcourseName()
    << endl;
    }//end main.cpp

The errors I keep getting back are main.cpp undefined reference to gradebook::getcourseName() and main.cpp undefined reference to gradebook::gradebook(std::string).

What causes the error?

@Julian: Please don't tag C++ questions as if they were "C". And we edit _out_ "thanks", rather than editing them _in_. — Lightness Races in Orbit, Jul 04 '15 at 16:58
Okay. Thanks a lot. I didn't know we have to edit out the thanks, and the C tag was a mistake. Thanks a lot for the info :-) — Julian E., Jul 04 '15 at 17:00

score 0 · Answer 1 · answered Jul 04 '15 at 16:30

0

string gradebook::getcouseName(){

Typo in function name here.

answered Jul 04 '15 at 16:30

timrau

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cool i fixed that but still getting the same error – rob Jul 04 '15 at 16:48
Looks like you didn't compile `gradebook.cpp`. – timrau Jul 04 '15 at 16:50
i tryed compiling it now and im getting a new error undefined reference to WinMain@16 i have no idea what's going on – rob Jul 04 '15 at 17:11
You need to compile _both_ gradebook.cpp and main.cpp – timrau Jul 04 '15 at 17:15

undefined reference error beginner here

1 Answers1