High-level Programming Language (Pascal)

Data Types

• determines how the value is represented in the memory
• Pascal provides a number of predefined data types
• denoted by the standard identifiers integer, real, boolean, char and reserved word string
  
  

  Data Types	Descriptions
  integer	are whole numbers that can be positive, zero or negative no decimal points, blank spaces or commas between digits not all integers can be represented because of the limitation of memory in the computer in Turbo Pascal, the acceptable range of integers is between 32767 and -32768 can perform calculation
  real	numbers containing decimal points no blank spaces or commas between digits can be expressed in either in decimal notation or in exponential notation for example, (i) 125.2 (in decimal notation) (ii) 1.252E+02 (in exponential notation) real constant must have at least one digit before and after the decimal point can perform calculation
  boolean	has two values only : true and false used to represented conditional value and decision-making
  char	can be a letter, a numeric digit, a punctuation symbol or a special symbol one of the symbol in ASCII character set consists of a single character enclosed within a pair of single quotation marks e.g. 'A', '8', '+' if the character is an apostrophe ( ' ), it must appear as a pair of apostrophes enclosed within a pair of single quotation marks i.e. ' " ' cannot perform calculation directly
  string	a sequence of zero or more (up to 255) characters enclosed in a pair of single quotation marks null string contains no character cannot perform calculation directly