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 |
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Libraries | page 74 |
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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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