std::isnormal
From cppreference.com
| Defined in header <cmath>
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| (1) | ||
bool isnormal( float num ); bool isnormal( double num ); |
(since C++11) (until C++23) |
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| constexpr bool isnormal( /* floating-point-type */ num ); |
(since C++23) | |
| Defined in header <cmath>
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| template< class Integer > bool isnormal( Integer num ); |
(A) | (since C++11) (constexpr since C++23) |
1) Determines if the given floating point number 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)
A) Additional overloads are provided for all integer types, which are treated as double.
Parameters
| num | - | floating-point or integer value |
Return value
true if num is normal, false otherwise.
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::isnormal(num) has the same effect as std::isnormal(static_cast<double>(num)).
Example
Run this code
#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
See also
| (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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