The analyze_trades program shown, for example, in Segment 377, is a keystone program, because it brings together many concepts, including C's mechanisms for reading, displaying, testing, conditional execution, iteration, and pointer dereferencing.

Now you are ready to tackle still more C mechanisms through further modifications to the analyze_trades program. In this chapter, for example, you learn how to use switch statements when you want your program to decide which of many alternative statements to execute.