HP SunSoft Pascal 4.0 Uživatelský manuál stáhnout pdf (Strana 21)

Preface xxi

• Appendix B, “Error Messages,” lists all the error messages the compiler

produces.

This guide concludes with an index.

Conventions Used in This Guide

This guide contains syntax diagrams of the Pascal language in extended

Backus-Naur Formalism (BNF) notation. Here are the meta symbols:

The following table describes the type styles and symbols used in this guide:

Table P-1 BNF Meta Symbols

Meta Symbol Description

::= Deﬁned as

| Can be used as an alternative

(a | b) Either a or b

[ a ] Zero or one instance of

{ a } Zero or more instances of a

'abc' The characters abc

Table P-2 Typographic Conventions

Typeface or

Symbol Meaning Example

AaBbCc123 The names of commands, ﬁles, and

directories; on-screen computer output

Edit your .login ﬁle.

Use ls -a to list all ﬁles.

hostname% You have mail.

AaBbCc123 What you type, contrasted with on-

screen computer output

hostname% su

Password:

AaBbCc123 Command-line placeholder:

replace with a real name or value

To delete a ﬁle, type rm ﬁlename.

AaBbCc123 Book titles, new words or terms, or

words to be emphasized

Read the User’s Guide.

These are called class options.

You must be root to do this.

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HP SunSoft Pascal 4.0 Uživatelský manuál Strana 21