23.1 Modules

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A module is a collection of functions or classes that perform related functions. For example, there could be a module to handle database functions such as lookup , enter , and sort . Another module could handle complex numbers , and so on.

Also, as programming problems get big, more and more programmers are needed to finish them. An efficient way of splitting up a large project is to assign each programmer a different module. That way each programmer only has to worry about the internal details of her own code.

In this chapter, we discuss a module to handle infinite arrays . The functions in this package allow the user to store data in an array without worrying about the array's size . The infinite array grows as needed (limited only by the amount of memory in the computer). The infinite array will be used to store data for a histogram, but it can also be used to store things such as line numbers from a cross-reference program or other types of data.

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