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std::isnormal

From cppreference.com
< cpp‎ | numeric‎ | math
 
 
 
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isnormal
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Defined in header <cmath>
bool isnormal( float arg );
(1) (since C++11)
bool isnormal( double arg );
(2) (since C++11)
bool isnormal( long double arg );
(3) (since C++11)
bool isnormal( Integral arg );
(4) (since C++11)
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).

Contents

[edit] Parameters

arg - floating point value

[edit] Return value

true if arg is normal, false otherwise

[edit] 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

[edit] See also

categorizes the given floating point value
(function) [edit]
(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 documentation for isnormal