C++ Math fpclassify()
The function returns the value of type int that matches one of the macro constants, depending on the value of x.
Suppose a number is x. Syntax would be:
x: The value which is to be matched with one of the macro constants.
It returns following integer values: FP_INFINITE, FP_NAN, FP_ZERO, FP_SUBNORMAL ,FP_NORMAL.
Let's see the simple example.
1.0/0.0 is a infinite number
In this example, fpclassify() function determines that x is a infinite number.