Intel® Fortran Compiler 17.0 Developer Guide and Reference

IEEE_IS_NAN

Elemental Module Intrinsic Function (Generic): Returns whether an IEEE value is Not-a-Number (NaN).

Module

USE, INTRINSIC :: IEEE_ARITHMETIC

result = IEEE_IS_NAN (x)

x

(Input) Must be of type REAL.

Results

The result type is default logical. The result has the value true if the value of x is NaN; otherwise, false.

Example

IEEE_IS_NAN (SQRT(-2.0)) has the value true if IEEE_SUPPORT_SQRT (2.0) has the value true.

See Also