HP 3000 Manuals

HP FORTRAN 77/iX Reference

STANDARD_LEVEL Directive 

The STANDARD_LEVEL directive sets the level of syntax that the compiler
processes routinely.

Syntax 

                {ANSI  }
$STANDARD_LEVEL {HP    }
                {SYSTEM}
If the compiler encounters a FORTRAN language feature not legal at the
specified level, it issues a warning message on the listing and then
compiles the feature normally.

ANSI             refers to the ANSI 77 FORTRAN standard (ANSI X3.9-1978).
                 Specifying the ANSI level is semantically equivalent to
                 specifying $ANSI ON. This level has the fewest language
                 features of the three.  Warnings are given for any
                 non-ANSI features. 

HP               the default, indicates Hewlett-Packard Standard FORTRAN
                 (FORTRAN 77).  This level allows more language features
                 than the ANSI level and includes the MIL-STD 1753
                 extensions.  Warnings are given for system-specific
                 features only.

SYSTEM           indicates FORTRAN 77 plus additional system dependent
                 features added to the language.  This level has the most
                 language features of the three.  No warnings are given
                 for nonstandard features.

Default               HP; allows MIL-STD 1753 extensions.

Location              STANDARD_LEVEL must appear before any nondirective
                      statement in a program unit, including the program
                      head.

Toggling/ Duration    Cannot be toggled after the appearance of
                      nondirective statements in a program unit.

Example 

     $STANDARD_LEVEL HP

MPE/iX 5.0 Documentation