The C++ Programming Language, Special Edition

Chapter 7. Functions

	To iterate is human, to recurse divine.
	--L. Peter Deutsch

Function declarations and definitions — argument passing — return values — function overloading — ambiguity resolution — default arguments — stdargs — pointers to functions — macros — advice — exercises.

Function Declarations

The typical way of getting something done in a C++ program is to call a function to do it. Defining a function is the way you specify how an operation is to be done. A function cannot be called unless it has been previously declared.

A function declaration gives the name of the function, the type of the value returned (if any) by the function, and the number and types of the arguments that must be supplied in a call of the function. For example: ...