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Programming > C Moderated > Re: Sorry, newb...
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Re: Sorry, newbie question about generating a random string

by Barry Schwarz <schwarzb@[EMAIL PROTECTED] > Mar 17, 2008 at 03:21 PM

On Sat, 8 Mar 2008 12:21:06 -0600 (CST), Scooter <slbentley@[EMAIL PROTECTED]
>
wrote:

>I'm trying to write a simple program to generate a random string. I
>have what seems to work, although I'm guessing there are better ways
>to do it. But my overall goal is to generate a random character, then
>add a second random character to it, then another, etc. until the
>string grows to a max of 10 characters. I'm testing a word wheel on a
>website but have to use 'C' and it is not my forte'. Anyway, here's
>what I have:
>
>int myRand,myLoop;
>char myChar[1];

What do you think the point of a one element array is?

>char myLoc[11];
>
>srand((unsigned int)time(0)); //Seed number for rand()
>
>for (myLoop =3D 0; myLoop < 10; myLoop++) {
>        myRand =3D rand() % 25 + 65;
>        myChar[0] =3D (char)myRand;
>	myLoc[myLoop] =3D  myChar[0] ;
>	printf("%s", myLoc);
>}
>
>
>
>I would expect the output to look something like:
>V
>VD
>VDY
>VDYW
>VDYWQ
>VDYWQA
>VDYWQAE
>VDYWQAEM
>VDYWQAEMQ
>VDYWQAEMQJ
>
>But instead it looks more like:
>V
>VD

Since there is no \n in the above code, how did you second output end
up on a new line?  Perhaps you would care to show us the actual coded.

>VDY
>VDYW=A6=0EB

Nowhere do we see where myLoc is initialized so how does your string
ever get terminated with a '\0'?  It appears that there were a few \0s
at the beginning of the array by happenstance but the W replaced one
and you are getting the garbage that is in myLoc[4] and following
elements.

>VDYWQ=0EB
>VDYWQAB
>VDYWQAE
>VDYWQAEM=FC=0EB
>VDYWQAEMQ=0EB
>VDYWQAEMQJB


Remove del for email
-- 
comp.lang.c.moderated - moderation address: clcm@[EMAIL PROTECTED]
 -- you must
have an appropriate newsgroups line in your header for your mail to be
seen,
or the newsgroup name in square brackets in the subject line.  Sorry.
 




 12 Posts in Topic:
Sorry, newbie question about generating a random string
Scooter <slbentley@[EM  2008-03-08 12:21:06 
Re: Sorry, newbie question about generating a random string
Keith Thompson <kst-u@  2008-03-17 15:19:13 
Re: Sorry, newbie question about generating a random string
=?utf-8?Q?Dag-Erling_Sm=C  2008-03-28 19:20:30 
Re: Sorry, newbie question about generating a random string
Keith Thompson <kst-u@  2008-03-30 14:58:21 
Re: Sorry, newbie question about generating a random string
Jack Klein <jackklein@  2008-03-17 15:19:52 
Re: Sorry, newbie question about generating a random string
Jonathan Leffler <jlef  2008-03-17 15:21:03 
Re: Sorry, newbie question about generating a random string
Barry Schwarz <schwarz  2008-03-17 15:21:22 
Re: Sorry, newbie question about generating a random string
Carl Barron <cbarron41  2008-03-17 15:21:31 
Re: Sorry, newbie question about generating a random string
Francis Glassborow <fr  2008-03-17 15:21:40 
Re: Sorry, newbie question about generating a random string
Kenneth Brody <kenbrod  2008-03-17 15:22:01 
Re: Sorry, newbie question about generating a random string
Vinicius Pinto <vinici  2008-03-17 15:22:07 
Re: Sorry, newbie question about generating a random string
David Thompson <dave.t  2008-03-28 19:20:14 

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tan12V112 Thu Jul 24 2:15:02 CDT 2008.