TOPS-20 PASCAL Language Manual - Bitsavers

APPENDIX D
SUMMARY OF PASCAL-20 EXTENSIONS TO PROPOSED ISO STANDARD
Category
Extension
Lexical and
syntactical
Semi reserved words:
REM
MODULE, OTHERWISE,
Exponentiation operator (**)
REM operator
Binary, hexadecimal, and octal
for integers
notation
Double-precision real data type
Dollar sign ($) and underscore ()
characters in identifiers
Identifiers of up to 31 characters
Predefined types
Predeclared Procedures
SINGLE, DOUBLE
CLOSE, DATE, FIND, HALT,
OPEN, TIME, MARK, RELEASE
LINELIMIT,
READ, READLN, WRITE,
and WRITELN extensions
Parameters of character string and
enumerated types for READ and READLN
Parameters of enumerated types for WRITE
and WRITELN
READ, READLN, WRITE,
and WRITELN extensions
Declarations
Statements
Procedures and Functions
Optional carriage-control specification
for text files with WRITE and WRITELN
variable initialization
OTHERWISE clause in CASE statement
External procedure and function
declar,ation
Support for calling externally declared
FORTRAN subroutines and for declaration
of PASCAL subroutines that can be called
by FOR'TRAN
Compilation
MODULE capability for combining
declarations and definitions to be
compiled independently from the main
progralltl
D-I