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Difference between revisions of "cpp/numeric/math/isnan"

From cppreference.com
< cpp‎ | numeric‎ | math
m (r2.7.3) (Robot: Adding de, es, fr, it, ja, pt, ru, zh)
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{{cpp/title|isnan}}
 
{{cpp/title|isnan}}
 
{{cpp/numeric/math/navbar}}
 
{{cpp/numeric/math/navbar}}
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{{dcl header | cmath}}
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{{dcl | notes={{mark since c++11}} |
 
bool isnan( float arg );
 
bool isnan( float arg );
 
}}
 
}}
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{{ddcl list item | notes={{mark since c++11}} |
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{{dcl | notes={{mark since c++11}} |
 
bool isnan( double arg );
 
bool isnan( double arg );
 
}}
 
}}
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{{dcl | notes={{mark since c++11}} |
 
bool isnan( long double arg );
 
bool isnan( long double arg );
 
}}
 
}}
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{{dcl end}}
  
 
Determines if the given floating point number {{tt|arg}} is not-a-number ({{tt|NaN}}).
 
Determines if the given floating point number {{tt|arg}} is not-a-number ({{tt|NaN}}).
  
 
===Parameters===
 
===Parameters===
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{{par begin}}
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{{param list item | arg | floating point value}}
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{{par | arg | floating point value}}
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===Return value===
 
===Return value===
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===See also===
 
===See also===
  
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{{dcl list template | cpp/numeric/math/dcl list fpclassify}}
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{{dsc inc | cpp/numeric/math/dcl list fpclassify}}
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{{dcl list template | cpp/numeric/math/dcl list isfinite}}
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{{dsc inc | cpp/numeric/math/dcl list isfinite}}
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{{dcl list template | cpp/numeric/math/dcl list isinf}}
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{{dsc inc | cpp/numeric/math/dcl list isinf}}
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{{dcl list template | cpp/numeric/math/dcl list isnormal}}
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{{dsc inc | cpp/numeric/math/dcl list isnormal}}
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{{dcl list template | cpp/numeric/math/dcl list isunordered}}
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{{dsc inc | cpp/numeric/math/dcl list isunordered}}
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[[de:cpp/numeric/math/isnan]]
 
[[de:cpp/numeric/math/isnan]]

Revision as of 19:20, 31 May 2013

 
C++
 
Numerics library
Common mathematical functions
Mathematical special functions (C++17)
Mathematical constants (C++20)
Basic linear algebra algorithms (C++26)
Floating-point environment (C++11)
Complex numbers
Numeric array (valarray)
Pseudo-random number generation
Factor operations
(C++17)
(C++17)
Interpolations
(C++20)
(C++20)
Saturation arithmetic
(C++26)
(C++26)
(C++26)
(C++26)
(C++26)

Generic numeric operations
Bit operations
(C++20)    
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++23)
(C++20)
 
Common mathematical functions
Functions
Basic operations
(C++11)  
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)(C++11)(C++11)
Exponential functions
(C++11)
(C++11)

(C++11)
(C++11)
Power functions
(C++11)
(C++11)
Trigonometric and
hyperbolic functions
(C++11)
(C++11)
(C++11)

Error and gamma functions
(C++11)
(C++11)
(C++11)
(C++11)
Nearest integer floating point operations
(C++11)(C++11)(C++11)
(C++11)
(C++11)
(C++11)(C++11)(C++11)
Floating point manipulation functions
(C++11)(C++11)
(C++11)
(C++11)
(C++11)(C++11)
(C++11)
Classification and comparison
(C++11)
(C++11)
(C++11)
isnan
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Types
(C++11)
(C++11)
(C++11)
Macro constants
 
Defined in header <cmath>
bool isnan( float arg );
 (since C++11)
bool isnan( double arg );
 (since C++11)
bool isnan( long double arg );
 (since C++11)

Determines if the given floating point number arg is not-a-number (NaN).

Parameters

arg - floating point value

Return value

true if arg is NaN, false otherwise

See also

Template:cpp/numeric/math/dcl list fpclassifyTemplate:cpp/numeric/math/dcl list isfiniteTemplate:cpp/numeric/math/dcl list isinfTemplate:cpp/numeric/math/dcl list isnormalTemplate:cpp/numeric/math/dcl list isunordered
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