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How do you write an NaN floating-point literal in C?
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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 Number Classification Functions).
Returns a quiet NaN (Not-A-Number) value of type double . The NaN values are used to identify undefined or non-representable values for floating-point elements, such as the square root of negative numbers or the result of 0/0.
NaN stands for Not A Number and is one of the common ways to represent the missing value in the data. It is a special floating-point value and cannot be converted to any other type than float. NaN value is one of the major problems in Data Analysis.
NaN, an acronym for Not a Number is an exception that usually occurs in the cases when an expression results in a number that is undefined or can't be represented. It is used for floating-point operations. For example: The square root of negative numbers.
In C99's <math.h>
7.12 Mathematics <math.h>
[#5] The macro
NAN
is defined if and only if the implementation supports quiet
NaNs for the float type. It expands to a constant
expression of type float representing a quiet NaN. |
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