****Constants**** are entities that remain unchanged throughout the program once they have been declared. Pascal allows the declaration of the following types of constants:




## Example
The following example shows the use of constants:

program pay_calculation (input,output);
const
tax_deduction = 10000;
bonus = 50000;
basic_pay = 40000;

var
total_pay, final_pay : real;   

begin
   
   total_pay := basic_pay + bonus;
   final_pay := total_pay - tax_deduction;
   
   writeln('The final pay is ',final_pay);
end.

Constant Type	Example
Ordinal (Integer)	no_of_employes = 250;
Character	Operator = ‘&’ ;
String	country = ‘Pakistan’;
Set	provinces = ( Punjab, Sindh, Baluchistan, KPK, Gilgit);
Pointer	thisPointer = NIL;

What are constants in Pascal?

Declaring constants

Example