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    The following form allows you to view linux man pages.

    Command:

    isnanl

    
    
    
    

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

    DESCRIPTION

           The finite(), finitef(), and finitel() functions return a nonzero value
           if x is neither infinite nor a "not-a-number" (NaN) value, and 0 other-
           wise.
    
           The isnan(), isnanf(), and isnanl() functions return a nonzero value if
           x is a NaN value, and 0 otherwise.
    
           The isinf(), isinff(), and isinfl() functions return 1 if x is positive
           infinity, -1 if x is negative infinity, and 0 otherwise.
    
    
    

    ATTRIBUTES

       Multithreading (see pthreads(7))
           The   finite(),  finitef(),  finitel(),  isinf(),  isinff(),  isinfl(),
           isnan(), isnanf(), and isnanl() functions are thread-safe.
    
    
    

    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 fpclas-
    
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