HP SunSoft Pascal 4.0 Uživatelský manuál stáhnout pdf (Strana 234)

210 Pascal 4.0 User’s Guide

Compiler Semantic Errors

The following sections explain the typical formats and terminology used in

Pascal error messages.

Format of the Error Diagnostics

In the example program above, the error diagnostics from the Pascal compiler

include the line number in the text of the program, as well as the text of the

error message. While this number is most often the line where the error

occurred, it can refer to the line number containing a bracketing keyword like

end or until. If so, the diagnostic may refer to the previous statement. This

diagnostic occurs because of the method the compiler uses for sampling line

numbers. The absence of a trailing semicolon (;) in the previous statement

causes the line number corresponding to the end or until to become

associated with the statement.

As Pascal is a free-format language, the line number associations can only be

approximate and may seem arbitrary in some cases.

Incompatible Types

Since Pascal is a strongly-typed language, many type errors can occur, which

are called type clashes by the compiler.

The Pascal compiler distinguishes among the following type classes in its

diagnostics:

When you compile mism.p, the

end-of-ﬁle is reached before an

end delimiter

hostname% pc mism.p

E 26020-------^--- Malformed declaration

15130-------^--- Unexpected end-of-file - QUIT

array integer scalar

boolean pointer string

char real varying

file record

1 2 ... 229 230 231 232 233 234 235 236 237 238 239 ... 332 333

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HP SunSoft Pascal 4.0 Uživatelský manuál Strana 234