http://msdn2.microsoft.com/en-us/library/s3f49ktz(VS.80).aspx
Here is a table that shows several types of variables

Name	Range	Examples
Int	–2,147,483,648 to 2,147,483,647	1, 0, -15, 435,423
Char	-128 to 127	C, O, C, K,
Bool	False or true	False
Float	3.4E +/- 38 (7 digits)	2.427365372, - 54.32124947
Double	1.7E +/- 308 (15 digits)	5.323928566206745420
Long	–2,147,483,648 to 2,147,483,647	1,157,458,697