How many prototype of function main in c?

ypzhuang · 07-29-2004, 04:36 AM

How many prototype of function main in c?And arguments means what??Thanks!!!

barisdemiray · 07-29-2004, 04:54 AM

Take a look at the thread 'main() confusioning in C'
http://www.linuxquestions.org/questi...hreadid=209979

sandeep_raju123 · 12-11-2008, 09:18 PM

there are only two prototypes of main, one without arguments and the other without arguments. The arguments are generally argc and *argv[].The argc signifies number of arguments whereas *argv[] represents the actual arguments. These are send while executing along with ./a.out

ErV · 12-11-2008, 09:37 PM

Quote:

Originally Posted by sandeep_raju123

there are only two prototypes of main, one without arguments and the other without arguments. The arguments are generally argc and *argv[].The argc signifies number of arguments whereas *argv[] represents the actual arguments. These are send while executing along with ./a.out

Look at the thread date before writing a reply.

sandeep_raju123 · 12-11-2008, 09:42 PM

the main has only two prototypes:

int main (void);
int main (int argc, char ** argv);

The argument argc is the number of command-line arguments passed to the program. The argument argv is a pointer to an array of strings, where argv[0] is the name you used to run your program from the command-line, argv[1] the first argument that you passed to your program, argv[2] the second argument, and so on.

Hko · 12-12-2008, 04:32 AM

Quote:

Originally Posted by sandeep_raju123

the main has only two prototypes:

int main (void);
int main (int argc, char ** argv);

Three:

Code:

int main(void);
int main (int argc, char **argv);
int main (int argc, char **argv, char **env);

dmail · 12-12-2008, 05:52 AM

Quote:

Originally Posted by Hko

Three:

Code:

int main(void);
int main (int argc, char **argv);
int main (int argc, char **argv, char **env);

Two

Quote:

5.1.2.2.1 Program startup
main is the only function that may portably be declared either with zero or two arguments. (The number of other functions’ arguments must match exactly between invocation and definition.)
This special case simply recognizes the widespread practice of leaving off the arguments to main when the program does not access the program argument strings. While many implementations support more than two arguments to main, such practice is neither blessed nor
forbidden by the Standard; a program that defines main with three arguments is not strictly conforming (see §J.5.1.)

*****

Hko · 12-12-2008, 09:07 AM

Quote:

[...]such practice is neither blessed nor
forbidden by the Standard;[...]

OK. Let's finish this issue at two-and-a-half. :-)

dmail · 12-12-2008, 09:19 AM

Quote:

Originally Posted by Hko

OK. Let's finish this issue at two-and-a-half. :-)

Quote:

a program that defines main with three arguments is not strictly conforming

OK I can stretch to 2.0000000000000000000000000000000000000000001

Hko · 12-13-2008, 08:53 AM

eh..........agreed!
:-)