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std::fpclassify

From cppreference.com
< cpp‎ | numeric‎ | math
 
 
Numerics library
 
Common mathematical functions
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fpclassify
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Defined in header <cmath>
(1)
int fpclassify( float num );

int fpclassify( double num );

int fpclassify( long double num );
(since C++11)
(until C++23)
constexpr int fpclassify( /* floating-point-type */ num );
(since C++23)
Defined in header <cmath>
template< class Integer >
int fpclassify( Integer num );
(A) (since C++11)
(constexpr since C++23)
1) Categorizes floating point value num into the following categories: zero, subnormal, normal, infinite, NAN, or implementation-defined category. The library provides overloads of std::fpclassify for all cv-unqualified floating-point types as the type of the parameter num.(since C++23)
A) Additional overloads are provided for all integer types, which are treated as double.

[edit] Parameters

num - floating-point or integer value

[edit] Return value

one of FP_INFINITE , FP_NAN , FP_NORMAL , FP_SUBNORMAL , FP_ZERO or implementation-defined type, specifying the category of num.

[edit] Notes

The additional overloads are not required to be provided exactly as (A). They only need to be sufficient to ensure that for their argument num of integer type, std::fpclassify(num) has the same effect as std::fpclassify(static_cast<double>(num)).

[edit] Example

Run this code
#include <cfloat>
#include <cmath>
#include <iostream>
 
auto show_classification(double x)
{
 switch (std::fpclassify(x))
 {
 case FP_INFINITE :
 return "Inf";
 case FP_NAN :
 return "NaN";
 case FP_NORMAL :
 return "normal";
 case FP_SUBNORMAL :
 return "subnormal";
 case FP_ZERO :
 return "zero";
 default:
 return "unknown";
 }
}
 
int main()
{
 std::cout << "1.0/0.0 is " << show_classification(1 / 0.0) << '\n'
 << "0.0/0.0 is " << show_classification(0.0 / 0.0) << '\n'
 << "DBL_MIN/2 is " << show_classification(DBL_MIN / 2) << '\n'
 << "-0.0 is " << show_classification(-0.0) << '\n'
 << "1.0 is " << show_classification(1.0) << '\n';
}

Output:

1.0/0.0 is Inf
0.0/0.0 is NaN
DBL_MIN/2 is subnormal
-0.0 is zero
1.0 is normal

[edit] See also

(C++11)
checks if the given number has finite value
(function) [edit]
(C++11)
checks if the given number is infinite
(function) [edit]
(C++11)
checks if the given number is NaN
(function) [edit]
(C++11)
checks if the given number is normal
(function) [edit]
provides an interface to query properties of all fundamental numeric types
(class template) [edit]
C documentation for fpclassify
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