ldexp - Online Linux Manual PageSection : 3
Updated : 2023-02-10
Source : Linux man-pages 6.03

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NAMEldexp, ldexpf, ldexpl − multiply floating-point number by integral power of 2

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#include <math.h>double ldexp(double x, int exp); float ldexpf(float x, int exp); long double ldexpl(long double x, int exp);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): ldexpf(), ldexpl(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

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DESCRIPTIONThese functions return the result of multiplying the floating-point number x by 2 raised to the power exp.

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RETURN VALUEOn success, these functions return x * (2^exp). If exp is zero, then x is returned. If x is a NaN, a NaN is returned. If 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 functions return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively, with a sign the same as x.

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ERRORSSee 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  errno is set to ERANGE. An overflow floating-point exception (FE_OVERFLOW) is raised. Range error, underflow  errno is set to ERANGE. An underflow floating-point exception (FE_UNDERFLOW) is raised.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue ldexp(), ldexpf(), ldexpl() Thread safetyMT-Safe

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STANDARDSC99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD.

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SEE ALSOfrexp(3), modf(3), scalbln(3) 0

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