Statements for Program Unit Calls and Definitions

The following table lists statements used for program unit definition and procedure call and return.

Name	Description
BLOCK DATA	Identifies a block-data subprogram.
CALL	Executes a subroutine.
COMMON	Delineates variables shared between program units.
CONTAINS	Identifies the start of module procedures within a host module, contained procedures within a procedure, or bound procedures within a type.
ENTRY	Specifies a secondary entry point to a subroutine or external function.
EXTERNAL	Declares a name to be that of a user-defined subroutine or function, making it passable as an argument.
FUNCTION	Identifies a program unit as a function.
INCLUDE	Inserts the contents of a specified file into the source file.
INTERFACE	Specifies an explicit interface for external functions and subroutines.
INTRINSIC	Declares a predefined function.
MODULE	Identifies a module program unit.
PROGRAM	Identifies a program unit as a main program.
RETURN	Returns control to the program unit that called a subroutine or function.
SUBROUTINE	Identifies a program unit as a subroutine.
USE	Gives a program unit access to a module.