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REPRESENT TRUE BY ...

Syntax:

REPRESENT TRUE BY LEAST SIGNIFICANT BIT REPRESENT TRUE BY LSB REPRESENT TRUE BY SIGN BIT

Function:

The command CORRECT USE OF INTEGER FOR LOGICAL instructs FPT to searche the code for instances of integer variables which are used to control logical IF statements. These are modified to logical expressions. The way in which the statements are modified depends on the commands:

REPRESENT TRUE BY LEAST SIGNIFICANT BIT

or

REPRESENT TRUE BY SIGN BIT

as shown in the examples below.

Where to use this command:

Operating system command line	Yes
Configuration file, config.fsp	Yes
Specification (FSP) files, *.fsp	Yes
Interactively, to FPT> prompt:	Yes
Interactive command files	Yes
Embedded in the Fortran code	Yes

Default:

REPRESENT TRUE BY LEAST SIGNIFICANT BIT

(Note that defaults may be changed in the configuration file).

Examples:

The code:

STATUS=LIB$GET_LUN(ICH) IF (.NOT. STATUS) CALL LIB$SIGNAL(%VAL(STATUS))

where STATUS is an integer variable, is corrected:

when REPRESENT TRUE BY LEAST SIGNIFICANT BIT is selected:

STATUS=LIB$GET_LUN(ICH) IF (.NOT. (IAND(STATUS,1) .NE. 0)) CALL LIB$SIGNAL(%VAL(STATUS))

when REPRESENT TRUE BY SIGN BIT is selected:

STATUS=LIB$GET_LUN(ICH) IF (.NOT. (STATUS .LT. 0)) CALL LIB$SIGNAL(%VAL(STATUS))

See Also:

CHECK DATA TYPE COERCION

CORRECT USE OF INTEGER FOR LOGICAL