HP SunSoft Pascal 4.0 Manual do Utilizador descarregar pdf (Página 91)

100

101

Program Construction and

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

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:

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.

Units page 67

Libraries page 74

program include (output);

#include "includefile"

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