new to C++, confused about separating code [closed]

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I am new to C++, and I'm having trouble segmenting my code. Here is my setu开发者_如何学JAVAp:

• A main.cpp that calls function that takes 2 int and 1 char* and returns int
• A function.h that contains, among other things, a function prototpye

int function(int a, int b, char* c);

• A function.cpp that contains the actual function definition.

I have used #include "function.h" in both function.cpp and main.cpp.

When I try to compile my code, I get that there is an undefined reference to function(int, int, char*) in my main() function.

What's wrong?

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I guess that you haven't "protected" your .h files from being included multiple times.

Always construct your .h files with this preprocessor lines:

#ifndef __MYHEADERFILEH__
#define __MYHEADERFILEH__

your header file "code" here

#endif

______MYHEADERFILEH____ Is a uniqe name, preferable the header file's name in uppercase. You put a #include "MyHeaderFile.h" In each .cpp or .c file using the header file.

If you post your code it will be easier to pinpoint the probem.

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*smacks head.

I left off a .cpp after the function file, so eclipse wasn't compiling that file. sorry!