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NAN (3)
  • >> NAN (3) ( Разные man: Библиотечные вызовы )
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    NAME

    INFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL - floating-point constants
     
    

    SYNOPSIS

    #define _ISOC99_SOURCE
    
    #include <math.h> INFINITY NAN HUGE_VAL
    HUGE_VALF
    HUGE_VALL
     

    DESCRIPTION

    The macro INFINITY expands to a float constant representing positive infinity.

    The macro NAN expands to a float constant representing a quiet NaN (when supported). A quiet NaN is a NaN ("not-a-number") that does not raise exceptions when it is used in arithmetic. The opposite is a signaling NaN. See IEC 60559:1989.

    The macros HUGE_VAL, HUGE_VALF, HUGE_VALL expand to constants of types double, float and long double, respectively, that represent a large positive value, possibly plus infinity.  

    CONFORMING TO

    C99.  

    AVAILABILITY

    On a glibc system, the macro HUGE_VAL is always available. Availability of the NAN macro can be tested using #ifdef NAN, and similarly for INFINITY, HUGE_VALF, HUGE_VALL. They will be defined by <math.h> if _ISOC99_SOURCE or _GNU_SOURCE is defined, or __STDC_VERSION__ is defined and has a value not less than 199901L.  

    SEE ALSO

    fpclassify(3), feature_test_macros(7), math_error(7)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    CONFORMING TO
    AVAILABILITY
    SEE ALSO
    COLOPHON


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