Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  INTERFACE
 
  [ USES      Clause ]
  [ CONST     Declarations ]
  [ TYPE      Declarations ]
  [ VAR       Declarations ]
  [ PROCEDURE Headings  ]
  [ FUNCTION  Headings  ]
  [ INLINE    Directive ]
 
  Description
 
    The interface section of a unit defines an interface to a unit's
    services. The interface can contain declarations of constants,
    types, variables, functions, and procedures. These declarations
    are public information; that is, a program using a unit has
    direct access to anything that is declared in that unit's
    interface. The actual definitions of the functions and procedures
    declared in a unit's interface are contained in the unit's
    implementation section.
 
    TIP:  To see working examples of unit interface sections, take
    a look at the QuickPascal standard units (System, Crt, Dos,
    MSGraph, and Printer). Simply place the cursor on any one of the
    unit names and press F1 to see the associated interface section.
 
  See also:  IMPLEMENTATION, UNIT, USES