Namespaces
Variants
Views
Actions

std::isnan

From cppreference.com
< cpp‎ | numeric‎ | math
Revision as of 02:28, 26 September 2013 by Cubbi (Talk | contribs)

 
 
 
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/Comparison
(C++11)
(C++11)
(C++11)
isnan
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Macro constants
(C++11)(C++11)(C++11)(C++11)(C++11)
 
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).

Contents

Parameters

arg - floating point value

Return value

true if arg is NaN, false otherwise

Notes

In C, isnan is a preprocessor macro, rather than a function.

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 normal
(function) [edit]
checks if two floating-point values are unordered
(function) [edit]
C documentation for isnan