code for comparing to Uppercase and lowercase if not the same output an error

I need to write a code that compares to an uppercase and if not an uppercase
to ouput an error message. Can anyone help?

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Follow-Ups:
- Re: code for comparing to Uppercase and lowercase if not the same output an error
  - From: Roedy Green
- Re: code for comparing to Uppercase and lowercase if not the same output an error
  - From: Roedy Green
- Re: code for comparing to Uppercase and lowercase if not the same output an error
  - From: Jeff Higgins
- Re: code for comparing to Uppercase and lowercase if not the same output an error
  - From: Joshua Cranmer

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