C++ Math fpclassify() Function

C++ Math fpclassify() Function with tutorial for beginners and professionals with examples on isgreaterequal(), less(), islessequal(), islessgreater(), isunordered(), exp(), frexp(), ldexp(), log(), log10(), modf(), exp2(), expm1(), log1p(), log2(), logb(), scalbn(), scalbln() etc.

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C++ Math fpclassify()

The function returns the value of type int that matches one of the macro constants, depending on the value of x.

value	description
FP_INFINITE	Positive or negative infinity
FP_NAN	Not a Number
FP_ZERO	Value of zero.
FP_SUBNORMAL	Sub Normal value
FP_NORMAL	Normal value

Syntax

Suppose a number is x. Syntax would be:

int fpclassify(float x);
int fpclassify(double x);
int fpclassify(long double x);
int fpclassify(int x);

Parameter

x: The value which is to be matched with one of the macro constants.

Return value

It returns following integer values: FP_INFINITE, FP_NAN, FP_ZERO, FP_SUBNORMAL ,FP_NORMAL.

Example

Let's see the simple example.

#include 
#include
using namespace std;
int main()
{
    double d=1.0/0.0;
    switch(fpclassify(d))
    {
    case FP_INFINITE:
    cout<<"1.0/0.0 is a infinite number ";  
    break;
    case FP_NAN:
    cout<<"1.0/0.0 is Not a Number";
    break;
    case FP_ZERO:
    cout<<"1.0/0.0 is zero.";
    break;
    case FP_SUBNORMAL:
    cout<<"1.0/0.0 is a subnormal value";
    break;
    case FP_NORMAL:
    cout<<"1.0/0.0 is a normal value";
    break;
    default:
    cout<<"wrong number";
    }
    return 0;
}

Output:

1.0/0.0 is a infinite number

In this example, fpclassify() function determines that x is a infinite number.

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