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In C, this is implemented as a macro that returns an int value. The type of x shall be float, double or long double. In C, it is implemented with function overloads. C isnan function tells if a value is a number Syntax. C isnan function has the following syntax. int isnanfpval Header. C isnan function is from header file math.h. 12/04/2016 · NaN is not-a-number floating point. As rule of thumb, isnan function should always be used to test for NaN instead of directly comparing the floating number with NaN literal. isnan is available in Visual C 2013 and newer. Developers who are using an earlier version of Visual C, can use _isnan. If Double.IsNaN0 / zero Then Console.WriteLine"Double.IsNan can determine whether a value is not-a-number." End If Remarks. Floating-point operations return NaN to signal that result of the operation is undefined. For example, dividing 0.0 by 0.0 results in NaN. Note. NaN is unordered: it is not equal to, greater than, or less than anything, including itself. x == x is false if the value of x is NaN. You can use this to test whether a value is NaN or not, but the recommended way to test for NaN is with the isnan function see Floating Point Classes.

The GNU C Library also supports these functions; however, we recommend that you use the ISO C99 macros in new code. Those are standard and will be available more widely. Also, since they are macros, you do not have to worry about the type of their argument. 25/08/2016 · hides isnan in in C14 / C11? Ask Question 20. 2. every C header, each of which has a name of the form name.h, behaves as if each name placed in the standard library namespace by the corresponding cname header is placed within the global namespace scope. I agree that C should require 754 2008 floating point, but there are good reasons for it not to; specifically, C is used in all kinds of environments that other than x86 -- including embedded devices that don't have hardware floating-point, and signal processing devices where programmers don't even want to use floating point. Floating point numbers can have special values, such as infinite or NaN. With the macro fpclassifyx you can find out what type x is. The macro takes any.

Click on a local variable, parameter or type parameter to highlight all references inline in source. Document Outline: In the document view, show the list of types and members in the file. Project Explorer: Display the tree view of files in the current project/assembly. Fossies Dox: grace-5.1.25.tar.gz "inofficial" and yet experimental doxygen-generated source code documentation isnan.c. Go to the documentation of this file. 1.

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