Date: 06 Sep 96 10:19:20 EDT From: Jan Knepper <100626.3506@CompuServe.COM> To: "[FreeBSD Hackers]" <freebsd-hackers@FreeBSD.ORG> Subject: Re: void main Message-ID: <960906141919_100626.3506_BHL134-1@CompuServe.COM>
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/*
> Strictly speaking, there are exactly two correct versions of main():
>
> int main(void);
>
> and
>
> int main(int argc, char *argv[]);
>
What's wrong with this version? ;-)
int main (int argc, char *argv[], char *env[]);
*/
Proza from the C++ Draft April 18 1995, Doc No:X3J16/95-0087:
3.6.1 Main function [basic.start.main]
1 A program shall contain a global function called main, which is the
designated start of the program.
2 This function is not predefined by the implementation, it cannot be
overloaded, and its type is implementation-defined. 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[argc-1] as pointers to the initial characters of null-terminated
multibyte strings (NTMBSs) 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. ]
3 The function main() shall not be called from within a program. The
linkage (_basic.link_) of main() is implementation-defined. The
address of main() shall not be taken and main() shall not be declared
inline or static. The name main is not otherwise reserved. [Example:
member functions, classes, and enumerations can be called main, as can
entities in other namespaces. ]
4 Calling the function
void exit(int);
declared in <cstdlib> (_lib.support.start.term_) terminates the pro-
gram without leaving the current block and hence without destroying
any objects with automatic storage duration (_class.dtor_). The argu-
ment value is returned to the program's environment as the value of
the program.
5 A return statement in main() has the effect of leaving the main func-
tion (destroying any objects with automatic storage duration) and
calling exit() with the return value as the argument. If control
reaches the end of main without encountering a return statement, the
effect is that of executing
return 0;
Don't worry, be Kneppie,
Jan
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