FINITE(3) Linux Programmer's Manual FINITE(3)

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

SYNOPSIS
       #include 

       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 featuretestmacros(7)):

       finite(), finitef(), finitel():
           BSDSOURCE || SVIDSOURCE
       isinf():
           BSDSOURCE || SVIDSOURCE || XOPENSOURCE >= 600 ||
           ISOC99SOURCE;
           or cc -std=c99
       isinff(), isinfl():
           BSDSOURCE || SVIDSOURCE
       isnan():
           BSDSOURCE || SVIDSOURCE || XOPENSOURCE || ISOC99SOURCE;
           or cc -std=c99
       isnanf(), isnanl():
           BSDSOURCE || SVIDSOURCE || XOPENSOURCE >= 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
       For   an   explanation   of   the  terms  used  in  this  section,  see
       attributes(7).

       ┌────────────────────────────────┬───────────────┬─────────┐
       │Interface                       │ Attribute     │ Value   │
       ├────────────────────────────────┼───────────────┼─────────┤
       │finite(), finitef(), finitel(), │ Thread safety │ MT-Safe │
       │isinf(), isinff(), isinfl(),    │               │         │
       │isnan(), isnanf(), isnanl()     │               │         │
       └────────────────────────────────┴───────────────┴─────────┘
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‐
       sify(3).

SEE ALSO
       fpclassify(3)

COLOPHON
       This  page  is  part of release 3.53 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/.



                                  2013-07-22                         FINITE(3)