How do I perform an unsigned right shift (>>> in J

问题:

How do I perform an unsigned right shift (>>> in Java) in C/C++?

回答1:

>>> is unsigned right shift, so I would think that in C this would be the same as

unsigned int foo;
unsigned int bar = foo >> whatever;

回答2:

In C, to get an unsigned shift, you just do a shift on an unsigned type.

unsigned int result = (unsigned int)valueToBeShifted >> shiftAmount;

Note that there is no guarantee that >> on a signed type gives you a signed shift in C -- this is implementation defined behavior. Most common implementations produce a signed shift if the type is signed, however.