nan, nanf, nanl
From cppreference.com
| Defined in header
<math.h>
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| float nanf( const char* arg );
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(since C99) | |
| double nan( const char* arg );
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(since C99) | |
| long double nanl( const char* arg );
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(since C99) | |
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);.
[edit] Parameters
| arg | - | narrow character string identifying the contents of a NaN, or an empty string |
[edit] Return value
The NaN value that corresponds to the identifying string arg or zero if the implemntation does not support quiet NaNs.
[edit] See also
| (C99)
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checks if the given number is NaN (function) |
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C++ documentation for nanf, nan, nand
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