Can you specify the problem you are encountering, along with any error messages? The first thing I see is that you have a function prototype for a function called Circum, but are attempting to call a function named Circumference - neither of which has been defined. The prototypes will also need to be terminated with a semi colon. You've decalred a variable named raduis, but are trying to use a variable named radius, which has not been declared. In your Area function, the return statement will need to be terminated with a semi colon. You main function is defined as returning an int, but no such return call exists at the end of the function. You have used the incorrect syntax for a define statement...it should appear as follows:
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#define PI 3.14159
Those are a few items.
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Any one good at debugging?
I've been moderately successful at it in the past.