ieee_is_negative

NAME

IEEE_IS_NEGATIVE - Tests if x is negative

IEEE_IS_NEGATIVE ([X=]x)

Fortran

IEEE Standard for Binary Floating-point Arithmetic

The IEEE_IS_NEGATIVE intrinsic function returns the value TRUE if x is negative. Otherwise, it returns the value FALSE.

IEEE_IS_NEGATIVE accepts the following argument:

IEEE_IS_NEGATIVE is an elemental function. The name of this intrinsic cannot be passed as an argument.

IEEE_IS_NEGATIVE will not be invoked if IEEE_SUPPORT_DATATYPE(X) has the value false.

The IEEE intrinsic procedures use the named constants contained in a system module, so you must include the following statement in your program:

USE, INTRINSIC :: IEEE_ARITHMETIC

The result type and type parameter is default logical.

The result has the value true if the value of x is negative. That is, the IEEE_CLASS(x) must be one of the following values:

Otherwise, the result has the value false.

Example 1:

USE, INTRINSIC :: IEEE_ARITHMETIC
REAL   x
   ! Compute X.
IF (IEEE_IS_NEGATIVE(x)) THEN
   ! Do something.
ELSE
   ! Do something else.
END IF