Sams Teach Yourself C++ in 24 Hours, Third Edition

Summary

This chapter introduced functions. A function is, in effect, a subprogram into which you can pass parameters and from which you can return a value. Every C++ program starts in the main() function, and main() in turn can call other functions.

A function is declared with a function prototype, which describes the return value, the function name, and its parameter types. A function can optionally be declared inline. A function prototype can also declare default variables for one or more of the parameters.

The function definition must match the function prototype in return type, name, and parameter list. Function names can be overloaded by changing the number or type of parameters; the compiler finds the right function based on the argument ...