The
fpclassify() function are defined in header
math.h header in C and
cmath library in C++. This function is used to get the value of type int that matches one of the classification macro constants (depending on the value of x).
Syntax:
int fpclassify(int x);
int fpclassify(float x);
int fpclassify(double x);
int fpclassify(long double x);
Parameters: This method accepts a parameter
x which is the value to be matched with one of the macro constants of this method. It can be integer, float, double or long double.
Return Value: This function returns integer values for the macro constants as follows:
- FP_INFINITE: When the specified value is Positive or negative infinity
- FP_NAN: When the specified value is not a Number
- FP_ZERO: When the specified value is a zero.
- FP_SUBNORMAL: When the specified value is a positive or negative denormalized value
- FP_NORMAL: When the specified value is a positive or negative normalized non-zero value
Below example demonstrate the use of fpclassify() method:
Output:
For 1.0/0.0: Infinite Number
For 0.0/0.0: Not a Number
For -0.0: Zero
For 1.0: Normal value
