3.9. Key Point Summary
C++ functions have definitions and declarations. Function prototypes must always precede function calls.
Inline functions give you the type safety of functions with the performance of macros.
Recursive functions make extensive use of the run-time stack but are often simple and elegant solutions to complex problems.
Pointers to functions allow you to call functions through data structures, such as dispatch tables.
With function prototypes and definitions, all sizes of a multidimensional array argument are necessary except the first one. All sizes must be constant integer expressions, and the first size is optional.
Function signatures with default arguments obey the Positional Rule: arguments without default values must appear ...
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