HP Fortran Programmer Guide (766160-001, March 2014)

the expression foo**baris legal in HP FORTRAN 77™but not in HP Fortran™. (HP FORTRAN
77 ™coerces COMPLEX(16)entities to COMPLEX(8)in order to continue the computation.)
Given the previous declarations, the following is acceptable in HP Fortran™:
foo**REAL(bar, 8) ! foo**bar
See the HP Fortran Programmer's Reference for information about theREAL intrinsic.
Input/output
The following I/O specifiers are recognized by the OPENstatement and by other I/Ostatements in
HP FORTRAN 77™ but are not supported in HP Fortran™:
ACCESS=expr1, where expr1is a constant expression other than DIRECTor SEQUENTIAL.
• IOSTAT=
• KEY=
• NAME=
• READONLY
• STATUS=expr2, where expr2is a constant expression other than OLD, NEW, UNKNOWN,
REPLACE, or SCRATCH.
• TYPE=
In general, HP FORTRAN 77™ allows more specifiers (and more options to specifiers) than does
HP Fortran™. There are additional differences between the HP FORTRAN 77™ version of the
OPENstatement and the HP Fortran™ version; compare the description ofOPEN in the HP Fortran
Programmer's Reference with that in the HP FORTRAN/9000 Programmer's Reference.
In HP FORTRAN 77™, namelist-directed output character strings are always quote-delimited; how
and whether such strings are delimited in HP Fortran depends on the DELIM= specifier. Also, HP
FORTRAN 77 allows the NAMELISTstatement to appear after executable statements; HP Fortran
does not. For more information about the NAMELIST statement, see the HP Fortran Programmer's
Reference.
Directives
Only a small number of the compiler directives from HP FORTRAN 77™ are supported under HP
Fortran. These are:
• ALIAS
• CHECK_OVERFLOW
• LIST
• OPTIMIZE
• SHARED_COMMON
The syntax and functionality of individual directives has also changed; for detailed information
about the HP Fortran™ directives, see the HP Fortran Programmer's Reference.
All unsupported directives should be deleted or replaced by HP Fortran code that results in the
same functionality (see Table on page 228).
134 Migrating to HP Fortran