Editing MAD (programming language) (section)

=== Functions ===
Function names end with a period. Internal and external functions are supported. Internal functions are compiled as part of the program in which they are used and share declarations and variables with the main program. External functions are compiled separately and do not share declarations and variables. A one statement definition of internal functions is permitted. Recursive functions are permitted, although the function must do some of the required saving and restoring work itself.

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* INTERNAL FUNCTION ''function-name''.(''argument-list'') = ''expression'' (single statement definition)
* INTERNAL FUNCTION ''function-name''.(''argument-list'')
* EXTERNAL FUNCTION ''function-name''.(''argument-list'')
* ENTRY TO NAME ''name''.
* END OF FUNCTION (last statement in a multiple line definition)
* FUNCTION RETURN [ ''expression'' ]
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* ERROR RETURN (force an error return to a statement or to the operating system, if no error statement is given as last argument of the call)
* SAVE RETURN
* RESTORE DATA
* RESTORE RETURN
* EXECUTE ''procedure''.(''argument-list'') (call a non-single valued function)
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