No, that's not quite the right idea for an expression.  An expression is a statement or set of statements that returns a value.  A simple expression is 2+2, which returns 4.  The value returned doesn't have to be numeric.  1==1 is an expression which would return 'true' (a boolean data type.) 

if-else statements are going to make logical decisions in your program.  By themselves, they aren't going to pass back a value. 

The Wikipedia page on expressions is mildly helpful.

http://en.wikipedia.org/wiki/Expression_%28programming%29

I'm just starting to study programming and your explanation made a lot of stuff clear. Thanks!
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I and [url=http://][/url] are inseparable!

ooh, i like the link to wikipedia's spam page:

http://en.wikipedia.org/wiki/Spam_(electronic)   

very nice.

also thanks for the links, MC.