execution before main

HI

Yes C++ programs are easy, but if you're stuck with good
old C, ...

Did you try the -v switch when you compile and LINK
something simple like HelloWorld.c?  My compiler attempts
to link with "__start" This is the first function to run,
it accepts all the command line arguments and then passes
them to 

    int main(int argc, char * argv[] )

So this is the function that always executes before main().
 I'm not sure exactly how you would modify it, but checking
your compiler documentation may help.  I also believe you
can set your linker command line to link to something else
prior to calling __start.

Please keep us posted how this works!

happy coding.


--- sumit kumar <[email protected]> wrote:

>   At 05:54 2005-12-27, Jitendra Kumar wrote:
> >Hi all to the members of wonderful forum,
> >
> >Y'day i had an interview, this was the qstn:
> >
> >Write a program which will execute before the main
> >function, dont use #pragma or compiler level programs?
> 
> what language?  If C++, trivial:   write a struct 
> or class with your program in the constructor.
> define an instance as a global variable.
> 
> in C?  I have no idea.
> 
> 
> >Pls post the answer.
> >Thanku,
> >
> >Jitendra
> Maneesh Anand Samria <[email protected]> wrote:
>     Lets try this 
>   #include<stdio.h>
> int before()
> {
>  printf("HELLO");
>  return 1;
> }
> int i = before();
> void main()
> {
>  printf("main");
> }
> 
>     This wont work since initialiser must be a constant. 
>    
>   Regards,
>   Sumit kumar
> 


HADZ.

The reasonable man adapts himself to the world; 
the unreasonable one persists in trying to adapt 
the world to himself. Therefore all progress depends 
on the unreasonable man. 
    --George Bernard Shaw, Man and Superman (1903) 
"Maxims for Revolutionists" Irish dramatist & socialist (1856 - 1950)


(this email sent using 100% recycled electrons)


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