Intel® Fortran Compiler Classic and Intel® Fortran Compiler Developer Guide and Reference

ID 767251
Date 11/07/2023
Public

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Document Table of Contents

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.