Thread: Help with Borland & Linking

Hello...this is my first time posting here, so if I screw up the code tags or something....

Okay, I'm having trouble getting multiple files to compile with Borland C++Builder 4.0 I followed my school textbook example, but it doesn't give compiler specific instructions. I've tried adding all the files to a project, but I get this error:

[Linker Error] Unresolved external 'GetSum(int, int)' referenced from C:\PROGRAM FILES\BORLAND\CBUILDER4\PROJECTS\FUNCTION\FUNCTION .OBJ

Here is the code:

Code:

//main.cpp

#include <iostream.h>
#include <conio.h>
#include "test.h"

int main()
{
        int num1=5;
        int num2=5;
        int sum;

        sum=GetSum(num1,num2);
        
        cout << sum;

        getch();
        return 0;
}

Code:

//getsum.cpp
#include "test.h"

int GetSum(int num1, int num2)
	{
	int sum;
	sum=num1+num2;
	return sum;
	}

Code:

//test.h
#ifndef SUM

int GetSum(int num1, int num2);

#define SUM
#endif

Is there a problem with my code, or am I not doing something to compile or link it right? If anyone has experience with C++Builder 4, I could really use your help with this. Thanks.

you simply forgot to define SUM in your main.cpp:

Code:

   #define SUM

because a compile time, because the macro SUM isn't define, the function GetSum isn't compiled!!

Does anyone else have some suggestions that I could try to get this program working? It's very hard trying to continue learning C++ when you can't have multiple file programs...I can't compile half of the examples, and my teacher never taught us anything about using C++Builder4 except making a new project and hitting the compile button.

At this point, I'm open to any ideas or suggestions. Thank you.