NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c-part1/9145

Internet Message Format | 1996-08-05 | 1.8 KB

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From: Lawrence Kirby <[e-mail]>
Newsgroups: comp.lang.c
Subject: Re: passing arguments to main()
Date: Wed, 06 Mar 96 22:07:47 GMT
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References: <4h78t1$[e-mail]> <4h7ql8$[e-mail]> <4hiqms$[e-mail]>
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In article <4hiqms$[e-mail]> sanidas "BIO" writes:

>I'm not sure I understand your question.  I think you may want to look at the
>two variables argc and argv.  Declared like this:
>
>main(int argc, char* argv[])
>{
>/*C code here*/
>
>return;
>}
>
>argc is an integer that counts the number of commands on the command line

I assume you mean the number of command line arguments. A program is
generally invoked by a single command.

> (it
>is always at least one because the executable file name counts as a command).

The program name is counted in argc. However the C language allows argc
to be 0 where there is neither a program name nor any command line arguments
available. A partable C program will not assume that argc is nonzero.

>argv is an array of pointers that point to a character array.

argv is a pointer to the first element of an array of char * pointers.
Each char * pointer points to the first element of an array of char whose
contents is a string (i.e. a sequence of characters ending in the null
character). The last pointer in the array of char * (i.e. argv[argc]) is a
null pointer.

--
-----------------------------------------
Lawrence Kirby | [e-mail]
Wilts, England | [e-mail]
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