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

NAME

       isinf, isnan, finite - test for infinity or not-a-number (NaN)

SYNOPSIS

       #include <math.h>

       int isinf(double value);

       int isnan(double value);

       int finite(double value);

DESCRIPTION

       The  isinf  function returns -1 if value represents negative infinity, 1

       if value represents positive infinity, and 0 otherwise.

       The isnan function returns a non-zero value if value  is  "not-a-number"

       (NaN and 0 otherwise.

       The  finite  function returns a non-zero value if value is neither infi&#9564;

       nite nor a "not-a-number" (NaN) value, and 0 otherwise.

CONFORMING TO

       BSD 4.3

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