Lecture Notes – September 20^th

A reserved word is a word that can’t be used as an identifier

Pre-defined terms can be used in a different context, but lose access to their original context when they are redefined.

Pascal has three loop constructs	FORTRAN IV has only 1
Pascal has two selection constructs	FORTRAN IV had 4 (or 5, depending on whether you count the END= and ERR= as separate ones)
Pascal has mod as an operator	FORTRAN IV had MOD as a function
Pascal has 2 distinct division operators	FORTRAN IV has only 1
Pascal has 36 reserved words	FORTRAN IV has none
Pascal uses and, or, not	FORTRAN IV uses .AND. .OR. .NOT.
Pascal’s and takes precedence over its or	FORTRAN IV …
Pascal has a function for exponentiation	FORTRAN IV has an operator for raising a number to a power **
Pascal can pass parameters by reference or by value	FORTRAN IV passes all parameters by reference
Pascal has two types of subprograms FUNCTION and PROCEDURE	FORTRAN IV has two types of subprograms – FUNCTION and SUBROUTINE
	FORTRAN has a much richer set of built-in functions
Pascal’s standard input and output devices are referenced by INPUT, OUTPUT	FORTRAN’s standard input and output devices are referenced by numbers (usually 5 and 6 respectively)
Pascal requires that the subprograms precede the BEGIN in a program.	FORTRAN let you place your subprograms at the top of the main program or after it. -
Pascal did not have separate compilation units	FORTRAN has separate compilation units
Pascal requires that you declare every variable	FORTRAN has default declarations
Pascal labels are 1 to 4 digits	FORTRAN labels are numbers
Pascal assignment operator is :=	FORTRAN assignment operator =