Date:         Tue, 23 May 2006 13:55:51 +0000
Reply-To:     toby dunn <tobydunn@HOTMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         toby dunn <tobydunn@HOTMAIL.COM>
Subject:      Re: Very Simple: Do Until
Comments: To: franz_cl2003@YAHOO.FR
In-Reply-To:  <20060523134142.81856.qmail@web25603.mail.ukl.yahoo.com>
Content-Type: text/plain; format=flowed

Franz simple math:

In the first data step you are decreaseing Stock by one unit and therefore
if you keep decreaseing the value for stock by one unit it will eventually
reach 0.

In the second data step you are decreasing the value of stock by 2.  And
since stock starts with a value of 5 no matter how many times you substract
2 units from the value of stock it will never be equal to 0 (which is what
you are testing for in the do until).  If you switcj the initial value of
Stock to say 6, it will stop correctly or if you change your until condition
to say

do until( stock <= 0 ) ;




Toby Dunn





From: Franz <franz_cl2003@YAHOO.FR>
Reply-To: Franz <franz_cl2003@YAHOO.FR>
To: SAS-L@LISTSERV.UGA.EDU
Subject: Very Simple: Do Until
Date: Tue, 23 May 2006 06:41:41 -0700

Dear all,

The first program runs very well.
But why not the second one?

First Prog.

data test;
stock =2;
nbr_  = 0;
do until(stock=0);
stock = stock -1;
nbr_ =  nbr_ +1;
output;
end;
run;


Second Prog.

data test;
stock =5;
nbr_  = 0;
do until(stock=0);
stock = stock-2;
nbr_ =  nbr_ +1;
output;
end;
run;

Thanks & regards,
Franz.

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