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Command: ldexpf | Section: 3 | Source: NetBSD | File: ldexpf.3
LDEXP(3) FreeBSD Library Functions Manual LDEXP(3)
NAME
ldexp, ldexpf, ldexpl - 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);
long double
ldexpl(long double x, int exp);
DESCRIPTION
The ldexp() family of functions compute
x * 2^exp
for a real floating-point number x.
RETURN VALUES
The functions return the value of x times 2 raised to the power exp.
Otherwise the following may occur:
1. If x is NaN, a NaN is returned.
2. If exp is zero or x is either +- 0 or +-<infinity>, x is
returned.
3. If the call would cause an overflow, a range error occurs and
either +-HUGE_VAL, +-HUGE_VALF, or +-HUGE_VALL is returned,
depending on the sign of x and the type of the return value.
4. If an underflow would be caused by the correct value, and the
value is not representable, either 0.0 or an implementation-
defined value is returned.
SEE ALSO
frexp(3), math(3), modf(3)
STANDARDS
The described functions conform to ISO/IEC 9899:1999 ("ISO C99").
FreeBSD 14.1-RELEASE-p8 March 17, 2016 FreeBSD 14.1-RELEASE-p8