Standard Pascal

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In 1974, the creator of the Pascal language, Niklaus Wirth wrote a book with Kathleen Jensen, titled Pascal User Manual and Report published by Springer-Verlag. This book became a de-facto standard for the Pascal language. In 1983 the International Standards Organization (ISO) formalized the de-facto standard as ISO 7185:1983. In 1990 ISO released an updated version - ISO 7185 :1990 - that didn't introduce any new concepts, but cleared up ambiguities and corrected errors that were in the earlier version. The ISO 7185 standard is referred to as Standard Pascal. The standard defines the minimum level that a Pascal compiler must support in order to be a true compiler of the Pascal language.

Reserved Words

The following are the standard keywords (referred to as word-symbols in the ISO 7185) that all compilers must support:

• and
• array
• begin
• case
• const
• div
• do
• downto
• else
• end
• file
• for
• function
• goto
• if
• in
• label
• mod
• nil
• not
• of
• or
• packed
• procedure
• program
• record
• repeat
• set
• then
• to
• type
• until
• var
• while
• with

Symbols

The following symbols (which the standard refers to as special-symbols) are also part of the language:

• +
• ~
• *
• /
• = (equal)
• < (less than)
• > (greater than)
• [
• ]
• .
• ,
• :
• ;
• "
• (
• )
• <> (not equal)
• <=
• >=
• := (named becomes)
• ..

Functions and Procedures

There are a number of functions and procedures defined in Standard Pascal. Free Pascal implements all of them in the [[System unit].

Extensions

There are additional keywords which are not technically part of the Standard Pascal language but are used by FPC either for additional functionality such as for implementing objects, compatibility with the error recovery concepts exposed by C++, or to provide compatibility with Borland Pascal and earlier Pascal compilers. These keywords include:

implementation · finally · try · unit.

Types

There are the standard types:

integer · smallint · longint · real · boolean · string · char · byte

Modes supported by Free Pascal

Free Pascal supports ISO 7185 Standard Pascal with the compiler mode option -Miso and ISO/IEC 10206 Extended Pascal with -Mextendedpascal. Support of ISO 7185 started with version 3.0.0.

External links

• Standard Pascal, reference information about the ANSI ISO 7185 standard.
• ISO 7185:1990, official normative version of the Pascal standard.
• ISO/IEC 10206:1991: Extended Pascal standard