Re: Regular expression: How to determine wether entry is a number?

[jwkrahn@xxxxxxx (John W. Krahn)]

Jan-Henrik wrote:
> Dear Group,
>
> I'm new to Perl and I have a simple question:
>
> I ask for the entry of a number vie <STDIN>:
>
> ----------------------------------------
> #!/usr/bin/perl -w
> use strict;
>
> my $foo;
> print "Enter number: ";
> $foo = <STDIN>;
> comp($foo);
> ----------------------------------------
>
> Now I would like to check wether the user really entered a number and
> not letters. What would a check like that look like?

perldoc -q "How do I determine whether a scalar is a number"


John
--
Perl isn't a toolbox, but a small machine shop where you
can special-order certain sorts of tools at low cost and
in short order.                            -- Larry Wall