Upper boolean and lower boolean [duplicate]

This question already has answers here: 开发者_StackOverflow社区 Closed 12 years ago.

Possible Duplicate:

Is there a difference between YES/No,TRUE/FALSE and true/false in objective-c?

What is the difference between upper boolean and lower boolean? Ex: true and TRUE. Thanks for any answers!

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It depends on the language... Some languages only like True or False (Python), some like all lowercase (Java - I think), and some don't care (PHP, Ruby)