Lots of logical ORs

teammatt3 posted this at 16:22 — 21st February 2007.

Joined: Sep 2003

There has got to be a better way to do this.

Say you want to see if a character entered is 0-9.

You would write code like

if(char_entered == '0' || char_entered == '1' || char_entered == '2' ...)
{
   puts("Hah, you entered a character that looks like a number");
}

Is there a way you can do the same thing (in any language) without listing every single character? I know I could use a case (switch) structure too, but that would be harder I think.

timjpriebe posted this at 16:43 — 21st February 2007.

He has: 2,667 posts

Joined: Dec 2004

Two words: Regular expressions.

The specifics would depend on what language you end up using. But you'll end up with something more like (this is pseudo-code):

if (char_entered =~ /[0-9]/)
{
  puts{"Looks like a number");
}

Tim
http://www.tandswebdesign.com

andy206uk posted this at 12:32 — 22nd February 2007.

He has: 1,758 posts

Joined: Jul 2002

in php you would do:

if(is_numeric($char)) {
    echo("it's a number!");
}