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isnanl (3)
  • >> isnanl (3) ( Linux man: Библиотечные вызовы )
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    NAME

    finite, finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl -
    BSD floating-point classification functions
     
    

    SYNOPSIS

    #include <math.h>
    
    int finite(double x);
    
    int finitef(float x);
    int finitel(long double x); int isinf(double x);
    int isinff(float x);
    int isinfl(long double x); int isnan(double x);
    int isnanf(float x);
    int isnanl(long double x);

    Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

    finite(), finitef(), finitel(): _BSD_SOURCE || _SVID_SOURCE
    isinf(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; cc -std=c99
    isinff(), isinfl(): _BSD_SOURCE || _SVID_SOURCE
    isnan(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE || _ISOC99_SOURCE; cc -std=c99
    isnanf(), isnanl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600  

    DESCRIPTION

    The finite() functions return a non-zero value if x is neither infinite nor a "not-a-number" (NaN) value, and 0 otherwise.

    The isnan() functions return a non-zero value if x is a NaN value, and 0 otherwise.

    The isinf() functions return 1 if x is positive infinity, -1 if x is negative infinity, and 0 otherwise.  

    NOTES

    Note that these functions are obsolete. C99 defines macros isfinite(), isinf(), and isnan() (for all types) replacing them. Further note that the C99 isinf() has weaker guarantees on the return value. See fpclassify(3).  

    SEE ALSO

    fpclassify(3)  

    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
    NOTES
    SEE ALSO
    COLOPHON


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