isinf(3) - NetBSD Manual Pages

Command: Section: Arch: Collection:  
ISINF(3)                NetBSD Library Functions Manual               ISINF(3)


NAME
isinf -- test for infinity
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <math.h> int isinf(real-floating x);
DESCRIPTION
The isinf() macro determines whether its argument x is an infinity (posi- tive or negative). An argument represented in a format wider than its semantic type is converted 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 an infinity. VAX Infinities are not supported.
RETURN VALUES
The isinf() macro returns a non-zero value if the value of x is an infin- ity. Otherwise 0 is returned.
SEE ALSO
fpclassify(3), isfinite(3), isinff(3), isnan(3), isnanf(3), isnormal(3), math(3), signbit(3) IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.
STANDARDS
The isinf() macro conforms to ISO/IEC 9899:1999 (``ISO C99''). NetBSD 7.0 March 5, 2004 NetBSD 7.0
Powered by man-cgi (2021-06-01). Maintained for NetBSD by Kimmo Suominen. Based on man-cgi by Panagiotis Christias.