Calculate area of a circle

[Skaperen]

yay! putting "things to calculate" in functions is generally a good thing. i can't think of a case not to though over time i might come up with one. but the case where not to define one in the current project is if that project has no need for it unless the project is a module intended to be imported by other code (i've done a few hundred of those).

if i am coding up just one function i usually add code to the same file to handle being run as a command to either run a test on the function or just do output based on command arguments.