Code::Blocks 10.05 Undefined reference to function

Question

I'm currently doing simple class example using Code::Blocks IDE 10.04. On creating new class I encounter undefined reference to myClass::myClass() error. Help me on figuring the error.

myclass.h:

#ifndef MYCLASS_H
#define MYCLASS_H
#include<string>
#include<iostream>
using namespace std;
class myClass
{
    public:
        myClass();
     void showMessage();
        virtual ~myClass();
    protected:
    private:
    string myString;
    int integer;
};

#endif // MYCLASS_H

myclass.cpp:

#include "E:\IOE\VII\Elective-DM\Assignment 2\myClass.h"

myClass::myClass()
{
    //ctor
}

myClass::~myClass()
{
    //dtor
}
void myClass::showMessage()
{
    cout<<"Enter the number ";
    cin>>integer;
    cout<<"Enter the String ";
    cin>>myString;
    cout<<"\nInterger you enter is :-"<<integer<<" and String you enter is "<<myString<<endl;

}

sinpleClass.cpp:

#include<E:\IOE\VII\Elective-DM\Assignment 2\myClass.h>
int main()
{
    myClass myClassObj;
    myClassObj.showMessage();
    return 0;
}

Please don't use absolute paths to header files... ever. This is most likely also the problem, since the path has "Assignment 2" in it. — StoryTeller - Unslander Monica, Jan 23 '13 at 16:27
@StoryTeller I used according to link [here](http://www.jusuchyne.com/codingchyne/2011/03/codeblocks-failed-to-find-the-header-file/) — Lionel, Jan 23 '13 at 16:29
It's a workaround, not a solution. Furthermore, it was a mistake on their part to even offer that workaround. Don't do it. — StoryTeller - Unslander Monica, Jan 23 '13 at 16:30
I have not used Codeblocks for years so I do not remember the details on how it builds projects. However is myclass.cpp included in your project's source files? — drescherjm, Jan 23 '13 at 16:33
Looks like a source file / project management issue. Is your `myclass.cpp` part of the project? Is it passed to the Linker? — Thomas Matthews, Jan 23 '13 at 16:33
@ThomasMatthews no... I just tried to add class on snipleClass.cpp and it make header file and cpp file ... I just tried to add new class — Lionel, Jan 23 '13 at 16:36
@Pattinson, But do you have a project active, or is it just separate files? — chris, Jan 23 '13 at 16:37
@chris First I create `snipleClass.cpp` file then add class to it... no project active... — Lionel, Jan 23 '13 at 16:39
@Pattinson, Well, that would be your problem. No project means no linking when you hit build. — chris, Jan 23 '13 at 16:39
@chris Should we have to create to add class on file or not? — Lionel, Jan 23 '13 at 16:41
@Pattinson, Unless you do your own linking, you'll need a project any time you use a cpp file without a `main` in it, as is the implementation file in your example. — chris, Jan 23 '13 at 16:43

score 3 · Accepted Answer · edited May 23 '17 at 12:09

3

This error is occurs due to the linking error.Later I create new project (according to chris comment above on question) and add class to it the project compile successfully.

edited May 23 '17 at 12:09

Community

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answered Jan 23 '13 at 16:52

Lionel

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Code::Blocks 10.05 Undefined reference to function

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