Undefined reference to 'function()'

[jack101]

Hi,

I am beginner in C++ and am using Code::blocks. I have surfed the web and wanted to test a simple code. The code consists of a main.cpp, PrintTest.cpp, and PrintTest.h. When I use the function within main file (main.cpp), there is no problem. But, the following error pops out when the function is in a separate file. Any help will be appreciated.

Error:
undefined reference to 'PrintTest(int, int)'

// main.cpp code
#include <iostream>
#include <cstdlib>
#include "PrintTest.h"

using namespace std;

int PrintTest(int,int);

int main()
{

    int d;
    d = PrintTest(3,4);
    cout << "The result is " << d;
    return 0;

}

// PrintTest.cpp code
#include <iostream>
#include <cstdlib>
#include "PrintTest.h"

int PrintTest (int a, int b)
{
    int c;
    c = a + b;
    return c;

}

// PrintTest.h code
#ifndef PRINTTEST_H_INCLUDED
#define PRINTTEST_H_INCLUDED

#include <iostream>
#include <cstring>
using namespace std;

int PrintTest(int, int);

#endif // PRINTTEST_H_INCLUDED

[E0p9LyTq]

You are declaring int PrintTest(int, int) twice, once in your header file (line 41) and then again in your main unit (line 8).

Delete/comment out either one. Personally I would do the prototype at line 8, in your main unit. Keep the function prototype in your header file.

[ne555]

There is no problem with multiple declaration.


Your didn't configure your project properly
http://www.cplusplus.com/forum/general/113904/#msg622055