MirBSD manpage: isfinite(3)

ISFINITE(3)                BSD Programmer's Manual                 ISFINITE(3)

NAME

     isfinite - test for finite value

LIBRARY

     libc

SYNOPSIS

     #include <math.h>

     int
     isfinite(real-floating x);

DESCRIPTION

     The isfinite() determines whether its argument x has a finite value. An
     argument represented in a format wider than its semantic type is convert-
     ed to its semantic type first. The determination is then based on the
     type of the argument.

IEEE 754

     It is determined whether the value of x is zero, subnormal, or normal,
     and neither infinite nor NaN.

VAX

     It is determined whether the value of x is true zero or finite, and nei-
     ther dirty zero nor ROP.

RETURN VALUES

     The isfinite() macro returns a non-zero value if the value of x is fin-
     ite. Otherwise 0 is returned.

ERRORS

     No errors are defined.

SEE ALSO

     fpclassify(3), isnormal(3), math(3), signbit(3)

STANDARDS

     The isfinite() macro conforms to ISO/IEC 9899:1999 ("ISO C99").

MirBSD #10-current             October 29, 2003                              1