std::isnormal
Defined in header <cmath> |
||
---|---|---|
bool isnormal( float arg ); |
(1) | (since C++11) (constexpr since C++23) |
bool isnormal( double arg ); |
(2) | (since C++11) (constexpr since C++23) |
bool isnormal( long double arg ); |
(3) | (since C++11) (constexpr since C++23) |
bool isnormal( IntegralType arg ); |
(4) | (since C++11) (constexpr since C++23) |
1-3) Determines if the given floating point number
arg
is normal, i.e. is neither zero, subnormal, infinite, nor NaN.
4) A set of overloads or a function template accepting the
arg
argument of any
integral type. Equivalent to
(2) (the argument is cast to
double
).
Parameters
arg | - | floating point value |
Return value
true
if arg
is normal, false
otherwise.
Example
#include <iostream> #include <cmath> #include <cfloat> 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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