HP SunSoft Pascal 4.0 manual Program Construction Management, Units

Program Construction and	4
Management

This chapter is an introduction to the methods generally used to construct and manage programs using Pascal. It describes units and libraries in two separate sections:

Units	page 67
Libraries	page 74

Units

For many reasons, it is often inconvenient to store a program in a single file, as in the case of a very large program.

You can break up a program in several ways. Perhaps the simplest way is to use an include file. An include file is a separate file that is copied in by the compiler when it encounters an include compiler directive. For example, in the following program:

program include (output); #include "includefile"

the line #include "includefile" is a compiler directive to cpp(1), the Pascal compiler’s preprocessor. The directive instructs cpp(1) to find the file includefile and copy it into the stream before continuing.

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