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If I have changed the no of parameter at one place where the function is being called.

+7 votes
556 views

If I have changed the no of parameter at some place where the function is being called. How can I be assured that no place is remain. Because build is successful, I cant not declare in header file because it is already extern in many files.

Brief example is given below.

/* main.c */
#include <stdio.h>
extern fun (int i ,int j);
int main()
{
printf("\n In main \n");
fun(1,3);
return 0;
}
======================================================
/* fun.c */
#include<stdio.h>

int fun(int in)
{
int local1 = in;
int local2 = *(&in +1);
printf("\nlocal1 = %d\tlocal2 = %d\n",local1, local2);
return in;
}
posted Oct 14, 2013 by Vikas Upadhyay

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1 Answer

+2 votes

I think this should give a linker error.
It is better programming practice to include the extern defination in a .h file rather than including in all the required .c files.so any change in .h file will make the .c files including this .h be automatically recompiled.

answer Oct 14, 2013 by Sony Mohanty
Initially function was static then someone done it extern and every one started it using extern. Now product has thousands of files and function  is extern in a lot of places. So i faced this problem. Product build is successful :). No compile or linking error.
It seems like function overloading in C :)
commented Oct 14, 2013 by Vikas Upadhyay
Even I have tried there is no linking error.
commented Oct 15, 2013 by Vimal Kumar Mishra
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