Possible Duplicate:
Prefixing property names with an underscore in Objective C
In Objective-C book i am reading and in some of the code i saw, sometimes, people add underscores to the variable names.
While i realize that this is due to an established convention, I wonder:
Is there any significance whether underscore precedes or completes variable name?
For example take _name, name and name_ As Objective-C programmer, what if anything, does underscore signify to you?