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

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Revision as of 02:28, 26 September 2013

 
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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

(C++11)
 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]
(C++11)
 checks if two floating-point values are unordered
(function) [edit]
C documentation for isnan
Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/numeric/math/isnan&oldid=65687"