Difference between revisions of "cpp/numeric/math/nan"
From cppreference.com
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===Return value=== | ===Return value=== | ||
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The NaN value that corresponds to the identifying string {{tt|arg}} or zero if the implementation does not support quiet NaNs. | The NaN value that corresponds to the identifying string {{tt|arg}} or zero if the implementation does not support quiet NaNs. | ||
===See also=== | ===See also=== | ||
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{{dsc begin}} | {{dsc begin}} | ||
{{dsc inc | cpp/numeric/math/dsc isnan}} | {{dsc inc | cpp/numeric/math/dsc isnan}} | ||
Revision as of 05:40, 28 August 2013
| Defined in header <cmath>
|
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| float nanf( const char* arg ); |
(since C++11) | |
| double nan( const char* arg ); |
(since C++11) | |
| long double nanl( const char* arg ); |
(since C++11) | |
Converts the implementation-defined character string arg into the corresponding quiet NaN value. The call std::nan("string") is equivalent to the call std::strtod("NAN(string)", (char**)NULL);.
Parameters
| arg | - | narrow character string identifying the contents of a NaN, or an empty string |
Return value
The NaN value that corresponds to the identifying string arg or zero if the implementation does not support quiet NaNs.
See also
| (C++11) |
checks if the given number is NaN (function) |
| [static] |
returns a quiet NaN value of the given floating-point type (public static member function of std::numeric_limits<T>)
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| C documentation for nanf, nan, nanl
| |
