c - integer downcast

Question

About integer numbers downcasts in C, e.g.

An int value 000F\'E000 downcast to short or unsigned short will become E000.
shor

Answer 1

Downcast cuts the bits, up-cast depends on "signedness". Up-cast on unsigned types adds zero bits to the value, up-cast on signed types replicates the sign bit. In this way, the expression has the same value before and after an upcast.