C++ Math isnan()
The function checks whether the number is a Not a Number or not. If the number is NaN, it returns 1 otherwise 0.
Note: The NaN is a non-representable value for floating point elements such as square root of negative number or the result of 0/0.
Suppose a number is 'x'. Syntax would be:
x: It is a floating point value.
It returns 1, if x is NAN otherwise 0.
Let's see the simple example when the value of x is 0.0/0.0.
value of x is : -nan isnan(x) : 1
In this example, isnan(x) determines that the value of x is nan. Therefore, it returns 1.
Let's see the simple example when the value of x is 4.3.
value of x is : 4.3 isnan(x) : 0
In this example, isnan(x) function determines that the value of x is not 'nan'. Therefore, it returns 0 value.
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