NAN

From cppreference.com
 
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Types
(哋它亢99)(哋它亢99)    

(哋它亢99)(哋它亢99)    
(哋它亢23)(哋它亢23)

Functions
Basic operations
(哋它亢99)
(哋它亢99)
(哋它亢99)
(哋它亢99)
(哋它亢99)(哋它亢99)(哋它亢99)(哋它亢23)
Maximum/minimum operations
(哋它亢99)
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)    
(哋它亢99)
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
Exponential functions
(哋它亢23)
(哋它亢99)
(哋它亢99)
(哋它亢23)
(哋它亢23)
(哋它亢99)
(哋它亢99)(哋它亢23)
(哋它亢23)
(哋它亢23)
Power functions
(哋它亢99)
(哋它亢23)
(哋它亢23)
(哋它亢99)
(哋它亢23)
(哋它亢23)
(哋它亢23)
Trigonometric and hyperbolic functions
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢99)
(哋它亢99)
(哋它亢99)
Error and gamma functions
Nearest integer floating-point operations
(哋它亢99)(哋它亢99)(哋它亢99)
(哋它亢23)
(哋它亢99)
Floating-point manipulation functions
Narrowing operations
Quantum and quantum exponent functions
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
Decimal re-encoding functions
(哋它亢23)
(哋它亢23)
(哋它亢23)
(哋它亢23)
Total order and payload functions
Classification
(哋它亢99)
(哋它亢23)
(哋它亢99)
(哋它亢99)
(哋它亢99)
(哋它亢99)
(哋它亢99)
(哋它亢23)
(哋它亢23)
(哋它亢99)
(哋它亢99)
(哋它亢99)
(哋它亢99)
(哋它亢99)
(哋它亢99)
(哋它亢23)
(哋它亢23)
Macro constants
Special floating-point values
(哋它亢99)(哋它亢99)(哋它亢23)
(哋它亢99)(哋它亢23)
NANDEC_NAN
(哋它亢99)(哋它亢23)
Arguments and return values
(哋它亢99)(哋它亢99)
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)    
(哋它亢23)(哋它亢23)
(哋它亢99)(哋它亢99)(哋它亢99)(哋它亢99)(哋它亢99)    
Error handling
(哋它亢99)(哋它亢99)
Fast operation indicators
(哋它亢99)(哋它亢99)
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)    
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)
(哋它亢99)(哋它亢23)
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)
(哋它亢23)(哋它亢23)(哋它亢23)(哋它亢23)
 
Defined in header <math.h>
#define NAN /*implementation defined*/
 (since 哋它亢99)

The macro NAN expands to a constant expression of type float, which evaluates to a quiet not-a-number (QNaN) value. If the implementation does not support QNaNs, this macro constant is not defined.

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Notes

There are many different NaN values, differentiated by their payloads and their sign bits. The contents of the payload and the sign bit of the NaN generated by the macro NAN are implementation-defined.

Example

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Run this code
#include <inttypes.h>
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
 
int main(void)
{
    const double f = NAN;
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}

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NAN:   nan 7ff8000000000000

References

  • 哋它亢23 standard (ISO/IEC 9899:2023):
  • 7.12/5 NAN (p: TBD)
  • F.10/11/13 NAN (p: TBD)
  • 哋它亢17 standard (ISO/IEC 9899:2018):
  • 7.12/5 NAN (p: TBD)
  • F.10/11/13 NAN (p: TBD)
  • 哋它亢11 standard (ISO/IEC 9899:2011):
  • 7.12/5 NAN (p: 232)
  • F.10/11/13 NAN (p: 518)
  • 哋它亢99 standard (ISO/IEC 9899:1999):
  • 7.12/5 NAN (p: 213)
  • F.9/11/13 NAN (p: 455)

See also

(哋它亢99)(哋它亢99)(哋它亢99)
 returns a NaN (not-a-number)
(function)
(哋它亢99)
 checks if the given number is NaN
(function macro)
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