ILOGB(3) | Library Functions Manual | ILOGB(3) |
ilogb
— return
exponent as an integer value
#include
<math.h>
int
ilogb
(double
x);
int
ilogbl
(long
double x);
int
ilogbf
(float
x);
The
ilogb
()
functions return the exponent of x as a signed integer value.
ilogb
(±0)
returns FP_ILOGB0.
ilogb
(±infinity)
returns INT_MAX.
ilogb
(x)
returns FP_ILOGBNAN if x is a NaN.
A range error may occur if x is 0, ±infinity, or a nan.
The special return values FP_ILOGB0 and FP_ILOGBNAN are defined in math.h, and may differ between platforms. INT_MAX is defined in limits.h.
The ilogb
() functions conform to ISO/IEC
9899:2011.
December 11, 2006 | macOS 14.6 |