Sender:	nate AT cartsys DOT com
Message-ID:	<366340DF.9248C2F@cartsys.com>
Date:	Mon, 30 Nov 1998 17:05:35 -0800
From:	Nate Eldredge <nate AT cartsys DOT com>
X-Mailer:	Mozilla 4.05 [en] (X11; I; Linux 2.0.35 i486)
MIME-Version:	1.0
To:	djgpp AT delorie DOT com
Subject:	Re: argv and Djgpp Yahoo club
References:	<005c01be1bbf$b00d07a0$5df5ffc2 AT default> <366197D5 DOT DFD AT cam DOT org>
Reply-To:	djgpp AT delorie DOT com

Vic wrote:
> 
> Susanne Hassing wrote:
> >
> > How do you use the argv command too make a programm like this:
> >
> > c:\>calc 21 3
> > 21-3=18
> > 21+3=24
> > 21/3=7
> > 21*3=63
> 
> a=atoi(argv[1]);
> b=atoi(argv[2]);
> 
> argv[1] contains 21, atoi converts a string to integer.
> the operations are as usual
> a-b
> a+b
> etc.

Note that this will make the program crash if you forget to give the
arguments.  The `argc' argument to `main' tells how many arguments were
passed, which means argv[0] .. argv[argc - 1] are valid.  (argv[0] is
the name of your program.)  Thus, check that argc >= 3 before
continuing.

-- 

Nate Eldredge
nate AT cartsys DOT com

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