ISNAN(3) | Library Functions Manual | ISNAN(3) |
isnan
—
#include <math.h>
int
isnan
(real-floating
x);
isnan
() macro determines whether its argument
x is not-a-number (“NaN”). 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.
isnan
() macro returns a non-zero value if the value
of x is a NaN. Otherwise 0 is returned.
IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.
isnan
() macro conforms to ISO/IEC
9899:1999 (“ISO C99”).
isnan
() function always returns 0, as the
architecture doesn't support NaN.
September 27, 2017 | NetBSD 9.0 |