undefined reference to 'function square'

Question

I am new to C programming. Please see the error in the snapshot below. I am getting undefined reference to 'square'. But when I write the function square inside the main.c file it's working!!GREAT
But I wonder what could be the reason. Please help!!
Forgive if its stupid.

This is main.c

#include "square.h"
int main()
{
    int x=4,y;
    y=square(x);
    printf("y is %d\n",y);
    return 0;
}

Now square.h

#ifndef SQUARE_H_INCLUDED
#define SQUARE_H_INCLUDED
#include <stdio.h>
#include <stdlib.h>
int square(int num);
#endif

Now square.c

int square(int num)
{
    int result;
    result=num*num;
    return result;
}

I have edited the code as well.{I am using code blocks IDE}

Please post code as text, not pictures of text, and not links to pictures of text. Also, what IDE are you using and how is it configured to compile? — dbush, Oct 13 '17 at 13:14
Being new is no excuse. You were provided with more than enough information about using the site _when you joined_, but you chose to ignore it. This is what happens when you do that. — dandan78, Oct 13 '17 at 13:20
You didn't show us the command you used to compile and (in particular) link the executable. Could you please [edit] to demonstrate that you don't have the same problem as in the marked duplicate question? — Toby Speight, Oct 16 '17 at 13:34

score 0 · Answer 1 · answered Oct 13 '17 at 13:17

0

main.c has no refernce to square implementation. Either add square.h file and include it both in square.c and im main.c or write squre implemenation in main.c

answered Oct 13 '17 at 13:17

Dror Moyal

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undefined reference to 'function square'

1 Answers1