Section (3) ldexp
ldexp, ldexpf, ldexpl — multiply floating-point number by integral power of 2
||long double x,|
These functions return the result of multiplying the
x by 2 raised to the power
On success, these functions return x * (2^exp).
exp is zero,
x is a NaN, a
NaN is returned.
x is positive
infinity (negative infinity), positive infinity (negative
infinity) is returned.
If the result underflows, a range error occurs, and zero is returned.
If the result overflows, a range error occurs, and the
HUGE_VALL, respectively, with a sign the
See math_error(7) for information on how to determine whether an error has occurred when calling these functions.
The following errors can occur:
- Range error, overflow
errnois set to ERANGE. An overflow floating-point exception (
FE_OVERFLOW) is raised.
- Range error, underflow
errnois set to ERANGE. An underflow floating-point exception (
FE_UNDERFLOW) is raised.
For an explanation of the terms used in this section, see attributes(7).
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning double also conforms to SVr4, 4.3BSD, C89.
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Linux libc source code
Lewine_zsingle_quotesz_s _POSIX Programmer_zsingle_quotesz_s Guide_ (O_zsingle_quotesz_Reilly & Associates, 1991)
386BSD man pages
Modified 1993-07-24 by Rik Faith (faithcs.unc.edu)
Modified 2004-10-31 by aeb