Basic conditional statement question.

*To*: mathgroup at smc.vnet.net*Subject*: [mg48653] Basic conditional statement question.*From*: jujio77 at yahoo.com (Scott)*Date*: Wed, 9 Jun 2004 04:17:30 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Here is a question I would think has a simple solution. Let's say I have some variable "a" which is an integer, but I haven't defined it in Mathematica. I want to run a conditional statement on it. Basically If[a!=0,Print["such and such"]] When I do something like this, Mathematica I asume is spitting out a null statement, because it doesn't do anything. So, how can I define "a" such that Mathematica knows it isn't =0 yet, still some integer. The reason I ask is I am calculating Christophel symbols (and such) and many of them =0, so I want to only output those that are not equal to zero. Thanks for any help, Scott

**Follow-Ups**:**Re: Basic conditional statement question.***From:*DrBob <drbob@bigfoot.com>