How do I force certain input?

[vic102482]

I have an input type promt for the user, but I want to make it so that they user cannot enter in any letters (a-z) only numbers. How do I do this?

Whoops sorry, I am using Perl programming laungaue

[chris_i386]

If you say wich programming language you are using, others may be able to help you... ;)

[while(1)]

Using a normal command prompt you are going to have a hard time preventing the user from entering letter .. but you can just verify the input and spit it back to the user it it contains letter...

OO

[chris_i386]

I can't help you with Perl, but I'll bump this thread up for you!

...bump!

[vic102482]

How do I spit back an error message?

would it be

unless ($b <=0 or $b >=0){do this?}

[while(1)]

I dont really use Perl (Python!!) but you could simply do:

> do a regex to check for letters
or
> treat the input as an array and go through it char by char and check its value

OO

[vic102482]

I will definatly check that out!

What is Python anyways?

[while(1)]

Python (www.python.org) is a scripting language much like perl, but newer and (I think) a little better.

BUT, a lot of people will tell you that Perl is better, or Ruby or .. or ..

Whichever you feel comfortable with is probably the better choice for you.

OO