Defined in header <cmath> | ||
|---|---|---|
| (1) | ||
bool isnormal( float num ); bool isnormal( double num ); bool isnormal( long double num ); | (since C++11) (until C++23) | |
constexpr bool isnormal( /* floating-point-type */ num ); | (since C++23) | |
| Additional overloads | ||
Defined in header <cmath> | ||
template< class Integer > bool isnormal( Integer num ); | (A) | (since C++11) (constexpr since C++23) |
num is normal, i.e. is neither zero, subnormal, infinite, nor NaN. The library provides overloads for all cv-unqualified floating-point types as the type of the parameter num. (since C++23)
double
| num | - | floating-point or integer value |
true if num is normal, false otherwise.
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::isnormal(num) has the same effect as std::isnormal(static_cast<double>(num)).
#include <cfloat>
#include <cmath>
#include <iostream>
int main()
{
std::cout << std::boolalpha
<< "isnormal(NaN) = " << std::isnormal(NAN) << '\n'
<< "isnormal(Inf) = " << std::isnormal(INFINITY) << '\n'
<< "isnormal(0.0) = " << std::isnormal(0.0) << '\n'
<< "isnormal(DBL_MIN/2.0) = " << std::isnormal(DBL_MIN / 2.0) << '\n'
<< "isnormal(1.0) = " << std::isnormal(1.0) << '\n';
}Output:
isnormal(NaN) = false isnormal(Inf) = false isnormal(0.0) = false isnormal(DBL_MIN/2.0) = false isnormal(1.0) = true
|
(C++11) | categorizes the given floating-point value (function) |
|
(C++11) | checks if the given number has finite value (function) |
|
(C++11) | checks if the given number is infinite (function) |
|
(C++11) | checks if the given number is NaN (function) |
C documentation for isnormal |
|
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