Calling function in a C++ source file from main

Question

I am using netbeans IDE for my C++ implementation. I have two source files main.cpp and univ.cpp. And i defined a function show() in univ.cpp. How can i call this function from main. When i call normally like below, i get "show() not in scope".

    int main(int argc, char**argv)
    {
       show();
       return 0;
    }

I don't want to use a separate header file and define the function. Instead i want to define this function in cpp source file like stated above.

Thanks.

@BartoszKP: More like "I don't want a driver's license, I just want to drive the damn car." — Kerrek SB, Aug 23 '14 at 11:52
Possible duplicate of [Effects of the extern keyword on C functions](http://stackoverflow.com/questions/856636/effects-of-the-extern-keyword-on-c-functions) — jww, Aug 23 '14 at 11:53

score 2 · Answer 1 · answered Aug 23 '14 at 14:15

2

You should create a header for univ called univ.h here would be the code:

#ifndef _UNIV_H_
#define _UNIV_H_

void show();

#endif

The you will need to include it in both cpp files.

#include <univ.h>

answered Aug 23 '14 at 14:15

Dan

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score 1 · Accepted Answer · answered Aug 23 '14 at 11:51

1

Declare the function:

int main(int argc, char **argv)
{
   extern void show();
   show();
}

answered Aug 23 '14 at 11:51

Kerrek SB

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Functions' declarations have by default `extern`al linkage, hence the keyword is redundant – Piotr Skotnicki Aug 23 '14 at 11:58
@PiotrS.: That's true. – Kerrek SB Aug 23 '14 at 11:59

Calling function in a C++ source file from main

2 Answers2