HP Fortran Programmer's Reference

Program units and procedures
External procedures
specification-part
execution-part
internal-procedure-part
130
is zero or more of the statements listed in Table 7-1 as well as the
AUTOMATIC statement.
is zero or more of the statements listed in Table 7-2 as well as the following
statements:
ENTRY statement
RETURN statement
takes the form:
CONTAINS
[internal-procedure]...internal-procedure
is the definition of an internal procedure; see “Internal procedures” on
page 135.
end-external-procedure-statement
Procedure reference
takes one of the following forms, depending on whether the procedure is a
subroutine or function:
END [SUBROUTINE [subroutine-name]]
END [FUNCTION [function-name]]
A procedure reference—also known as a procedure call—occurs when a procedure name is
specified in an executable statement, which causes the named procedure to execute. The
following sections describe references to subroutines and functions, and recursive
references—when a procedure directly or indirectly calls itself.
Referencing a subroutine
A reference to an external subroutine occurs in a CALL statement, which specifies either the
subroutine name or one of its entry point names. The syntax of the CALL statement is:
CALL subroutine-name [([actual-argument-list])]
actual-argument-list
is a comma-separated list of the actual arguments that take the form:
Chapter 7