54c
Subj : Re: while(in)
To   : borland.public.cpp.borlandcpp
From : Les Hurley <lesmail@pa.net>
Date : Mon Mar 22 2004 09:58 pm

Well here is the helpfile description of while:
Syntax
while [( condition )] [{statement_list}]

condition Either TRUE or FALSE. When FALSE, statement_list stops
executing.
statement_list The list of statements to execute.

Description
If no condition is specified, the while clause is equivalent to
while(TRUE).
Because the test takes place before any statements execute, if
condition
evaluates to FALSE on the first pass, the loop does not execute.

This sounds to me like the condition is tested before the statement
block is
entered and no statements executed if the condition is false.

"Wayne A. King" wrote:

> On Sun, 21 Mar 2004 23:05:26 -0500, Les Hurley <lesmail@pa.net> wrote:
>
> >   while(in){in>>n;
> >                 cout<<n<<"  ";}
>
> End of file is set when you try to read *past* the last data in the file.
> Thus the eof flag gets set the first time your in >> n extraction fails.
> But you're displaying the variable n even when the extraction fails,
> and it still contains the value from the last successful extraction.
> See if this works better:
>
> while(in >> n){cout<<n<<"  ";}
>
> --
> Wayne A. King
> (waking@idirect.com, Wayne_A_King@compuserve.com)

.

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