Scott_g wrote at Sun, 22 Jun 2003 15:21:24 -0500:
> Hello. I am new to Perl. I used to program in C years ago (not C++ #
> etc)
>
> I have the simplest question. I am running active state perl 5 on Win
> XP.
>
> I'm using OpenPERL Ide 1.0
>
> #!k:/perl/bin/perl.exe
> #
> # Camel-Learning Perl
> # Exercise 2-4
> # Input a & b from Console <STDIN>
> # Then multiply & print them
> #
> print "Enter an integer: ",$a=<STDIN>; # This don't work
Perl interpretes this as
print( "Enter an integer: ", $a=<STDIN> ); So it can executes print only
when both arguments are evaluated first, forcing you to enter $a before
you see the prompt.
> #
> print "Enter an integer: \n"; # Neither does
> this $a=<STDIN>; # ...
>
> This program excerpt above is driving me crazy! I can NOT get the PROMPT
> to appear BEFORE the program waits for input. I have tried several
> different ways to do this. No matter what I do, the screen stays blank,
> until I enter a value, THEN the prompt is printed! This works for me, but
> when I get into a larger program, the USER is going to have to read the
> PROMPT BEFORE they know what to type in!
Try instead the explicit
print("Enter an integer: "),$a=<STDIN>;
allthough I still would prefer in most cases to write the semicolon
instead of the comma
(but of course in some cases it's very useful like
print("..."),$x=<STDIN> unless defined($x);
)
Greetings,
Janek
PS: $a is a bad name for a variable as it is a global variable used for
sortings. (Read perldoc perlvar for details).
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