RE: [Dev-C++] A simple problem

[Ioannis V. <no...@ho...>]

> -----Original Message-----
> From: dev...@li... 
> [mailto:dev...@li...] On Behalf 
> Of Paul Ardeleanu
> Sent: Tuesday, November 19, 2002 1:47 PM
> To: dev...@li...
> Subject: [Dev-C++] A simple problem
> 
> 
> Can Anyone tell me why this code WORKS FINE in DevC++? 
> ANSI C says that it any Ansi compiler should give you an 
> error (see K&R
> book).
> Thank you very much!
> Paul
> 
> -----------------------------------------------------------
> main ()
> {
>   printf("hello, world
>   \n
>   
>   
>   ");
>   system("PAUSE");	
> }


It is valid C90 code (and not C99).

The main() thing is implicit int. In C90 you could do:


const x=7;

and it was equivallent to const int x=7;


main() was equivallent to int main(). This is not the case in C99.


Now both in C90 and C99 if you do not declare a function and you use it,
a declaration of the type


int whatever_you_use(); is assumed. The empty parenthesis is not
equivallent to (void) as in C++. Empty parenthesis means that you want
to skip argument checking.


So when you use printf() without <stdio.h>, int printf(); is assumed.


Ioannis Vranos
 
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