FP_CLASS

Elemental Intrinsic Function (Generic): Returns the class of an IEEE* real (binary32, binary64, and binary128) argument. This function cannot be passed as an actual argument.

result = FP_CLASS (x)

x	(Input) Must be of type real.

Results

The result type is INTEGER(4). The return value is one of the following:

Class of Argument	Return Value
Signaling NaN	FOR_K_FP_SNAN
Quiet NaN	FOR_K_FP_QNAN
Positive Infinity	FOR_K_FP_POS_INF
Negative Infinity	FOR_K_FP_NEG_INF
Positive Normalized Number	FOR_K_FP_POS_NORM
Negative Normalized Number	FOR_K_FP_NEG_NORM
Positive Denormalized Number	FOR_K_FP_POS_DENORM
Negative Denormalized Number	FOR_K_FP_NEG_DENORM
Positive Zero	FOR_K_FP_POS_ZERO
Negative Zero	FOR_K_FP_NEG_ZERO

The preceding return values are defined in file for_fpclass.for.

Example

FP_CLASS (4.0_8) has the value 4 (FOR_K_FP_POS_NORM).