LDEXP(3) BSD Library Functions Manual LDEXP(3)NAMEldexp — multiply floating-point number by integral power of 2
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
ldexp(double x, int exp);
float
ldexpf(float x, int exp);
DESCRIPTION
The ldexp() function multiplies a floating-point number by an integral
power of 2.
RETURN VALUES
The ldexp() function returns the value of x times 2 raised to the power
exp.
If the input x is a NaN, infinity, or 0.0, it is returned unchanged.
If the result would cause an overflow, the global variable errno is set
to ERANGE and infinity is returned, with the same sign as x.
If the result would cause underflow to 0.0, the global variable errno is
set to ERANGE and the value 0.0 is returned.
SEE ALSOfrexp(3), math(3), modf(3)STANDARDS
The ldexp() function conforms to ANSI X3.159-1989 (“ANSI C89”).
BSD March 21, 2006 BSD