Simple types

The following table shows the set of simple types in GLIDER. Besides the simple Pascal types, GLIDER adds the CONT, RET and FREQ simple types.

 
    REAL       		Real numbers

    INTEGER    		Integer numbers

    LONGINT    		Long integer numbers

    BOOLEAN    		Logic values (TRUE or FALSE)

    CHAR       		ASCII character set

    WORD       		Non negative integers

    BYTE       		Non negative integers in the range 0..255

    STR80      		ASCII character set

    TEXT       		ASCII character set

    CONT       		Continuous (for variables with derivatives in

                     		differential equations). Must be used in VAR

                     		only for a list of contiguous variables. See 4.7.

    RET        		Retard. To be used in the RETARD procedure. Must be

                     		used in VAR only. See 7.18.

    FREQ       		For component type of arrays to be used as

                     		multivariate frequency tables.

The user may also declare as new simple types:

• Enumerated types: ordered sets of identifiers.

  The syntax is:

  <type identifier> = (<list of identifiers>);

  Example:
  Size = (Small, Medium, Large, Extralarge);
Medium is then a constant of type Size. Order relations hold, for instance, Small < Large is true, ord(Large) has the value 3.

• Subrange types: subranges of any ordered type (INTEGER, LONGINT, CHAR, WORD, BYTE, and user's defined enumerated types) The syntax is:
  <type identifier> = <initial value> .. <final value>

  Examples:

           VAR CapLetter: 'A' .. 'Z';
               LargeSizes: (Large .. ExtraLarge);
           TYPE    Digits = 0 .. 9;