HP Fortran Programmer's Reference (September 2007)

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HP Fortran statements

ENTRY

Chapter 10350

• The RESULT (

result-name

) clause can only be speciﬁed when the ENTRY statement is

included in a function subprogram. If speciﬁed,

result-name

must differ from

entry-name

, and

entry-name

must not appear in any speciﬁcation statement in the

scoping unit of the function subprogram;

entry-name

assumes all the attributes of

result-name

. The RESULT clause in an ENTRY statement has the same syntax and

semantics as in a FUNCTION statement.

• If the ENTRY statement appears in a function, the result variable is that speciﬁed in the

FUNCTION statement; if none is speciﬁed, the result variable is

entry-name

• If the characteristics of the result variable speciﬁed in the ENTRY statement are the same

as those of the result variable speciﬁed in the FUNCTION statement, then the result

variable is the same, even though the names are different. If the characteristics are

different, then the result variables must be:

— Nonpointer scalars of intrinsic type

— Storage associated

— If any is of character type, they must all be of character type and must all have the

same length. If any is of noncharacter type, they must all be of noncharacter type.

• The result variable may not appear in a COMMON, DATA, or EQUIVALENCE statement. Also,

the result variable may not have the ALLOCATABLE, INTENT, OPTIONAL, PARAMETER, or

SAVE attribute.

•IfRECURSIVE is speciﬁed on the FUNCTION statement at the start of a function

subprogram, and RESULT is speciﬁed on an ENTRY statement within the subprogram, then

the interface of the function deﬁned by the ENTRY statement is explicit within the function

subprogram; the function can thus be invoked recursively. (Note that the keyword

RECURSIVE is not given on the ENTRY statement, but only on the FUNCTION statement.)

•IfRECURSIVE is speciﬁed on the SUBROUTINE statement at the start of a subroutine

subprogram, the interface of the subroutine deﬁned by an ENTRY statement within the

subprogram is explicit within the subprogram; the subroutine can thus be called

recursively.

• A dummy argument in an ENTRY statement must not appear in an executable statement

preceding the ENTRY statement, unless it also appears in a FUNCTION, SUBROUTINE, or

ENTRY statement preceding the executable statement.

• If a dummy argument in a subprogram—that is, as speciﬁed in a FUNCTION or SUBROUTINE

statement at the start of the subprogram or in any ENTRY statements within the

subprogram—is used in an executable statement, then the statement may only be

executed if the dummy argument appears in the dummy argument list of the procedure