RE: [Dev-C++] BC++, gcc and Win98SE shell

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

> -----Original Message-----
> From: Ioannis Vranos [mailto:no...@ya...] 
> Sent: Sunday, February 24, 2002 6:45 PM
> To: Dev-C++ (dev...@li...)
> Subject: RE: [Dev-C++] BC++, gcc and Win98SE shell
> 
> 
> Now something delicate. argc is *not* guaranteed to be one if 
> you do not pass any argument. It is guaranteed that if you 
> pass an argument then it will be non zero and argv[0] will be 
> the name of the program itself. In few words, if you do not 
> pass any name it is not guaranteed that argv[0] contains the 
> name of the program. As the C++ standard says:


That is wrong. The correct is: If argc>0 then argv[0] is the name of the
program, e.t.c.. In few words before you use argv you must always check
if argc>0.


> "An implementation shall not predefine the main function. 
> This function shall not be overloaded. It shall have a return 
> type of type int, but otherwise its type is 
> implementationdefined. All implementations shall allow both 
> of the following definitions of main: int main() { /* ... */ 
> } and int main(int argc, char* argv[]) { /* ... */ } In the 
> latter form argc shall be the number of arguments passed to 
> the program from the environment in which the program is run. 
> If argc is nonzero these arguments shall be supplied in 
> argv[0] through argv[argc1] as pointers to the initial 
> characters of nullterminated multibyte strings (NTMBSs)
> (17.3.2.1.3.2) and argv[0] shall be the pointer to the 
> initial character of a NTMBS that represents the name used to 
> invoke the program or "". The value of argc shall be 
> nonnegative. The value of argv[argc] shall be 0. [Note: it is 
> recommended that any further (optional) parameters be added 
> after argv. ]".
> 
> 
> 
> This is exactly the same for ANSI C89 and C99 too.


With the exception that in C it is int main(void) instead of int main().
Also C89 did not require any return value for main().



Ioannis
 
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