Reserved words, Predefined Identifiers, Identifiers and Special Characters

Useful Theory and Math - Module 2

2. Reserved words, Predefined Identifiers, Identifiers and special characters

Reserved Words:

These are specific words of a language which have a well determined meaning and cannot be used for anything else besides that meaning

Example:

Program, var, begin, end.

Predefined Identifiers

These are the words at an implementation level of the Pascal language which assume certain meanings.

Example:

Integer, writeln, readln, string, etc...

Identifiers

These are defined by us, such as variable names

Example:

Num1, Num2,..

Procedure names etc...

Special Characters

Separates instructions  ;                 
Separates elements when it comes to multiple declarations  ,                
limits arguments ( )              
limits string ' '               
comment {}             
assign value :=               
arithmetic operators + - * /        
end of program .