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LDEXP(3) BSD Library Functions Manual LDEXP(3)
ldexp, ldexpf -- multiply floating-point number by integral power of 2
Math Library (libm, -lm)
ldexp(double x, int exp);
ldexpf(float x, int exp);
The ldexp() family of functions compute
x * 2^exp
for a real floating-point number x.
The functions return the value of x times 2 raised to the power exp. Otherwise the follow-
ing may occur:
1. If x is NaN, a NaN is returned.
2. If exp is zero or x is either +- 0 or +-oo, 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 repre-
sentable, either 0.0 or an implementation-defined value is returned.
frexp(3), math(3), modf(3)
The described functions conform to ISO/IEC 9899:1999 (``ISO C99'').
BSD September 18, 2011 BSD
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