LOGB(3)

NAME
logb - return exponent as a floating-point number

SYNOPSIS
#include <math.h>
double
logb(double x);
long double
logbl(long double x);
float
logbf(float x);

DESCRIPTION
The logb() functions return the exponent of x, represented as a floating-point number.

SPECIAL VALUES
logb(±0) returns -infinity and raises the "divide-by-zero" floating-point exception.

logb(±infinity) returns +infinity.

SEE ALSO
ilogb(3)

STANDARDS
The logb() functions conform to ISO/IEC 9899:1999(E).