Functions
Because functions are the modules from which C++ programs are built and because they are essential to C++ OOP definitions, you should become thoroughly familiar with them. Because some aspects of functions are advanced topics, the main discussion of functions comes later, in Chapters 7, "Functions—C++'s Programming Modules," and 8. However, if you deal now with some basic characteristics of functions, you'll be more at ease and more practiced with functions later. The rest of this chapter introduces you to these function basics.
C++ functions come in two varieties: those with return values and those with none. You can find examples of each kind in the standard C++ library of functions, and you can create your own functions of each ...
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