C++ How to Program, 10/e

6.2 Program Components in C++

C++ programs are typically written by combining “prepackaged” functions and classes available in the C++ Standard Library with new functions and classes you write. The C++ Standard Library provides a rich collection of functions for common mathematical calculations, string manipulations, character manipulations, input/output, error checking and many other useful operations.

Functions allow you to modularize a program by separating its tasks into self-contained units. You’ve used a combination of library functions and your own functions in almost every program you’ve written.

There are several motivations for modularizing a program with functions:

• Software reuse. For example, in earlier programs, we did not have ...