Negative Bitwise Operations

Question

I read a book in C where some section says, "Bitwise operations are usually used with unsigned types."

Question: why?

Answer 1

Just because it is not immediately clear what bit operations on the sign bit of a signed number should mean.

• Unsigned types have no special bits, everything works straight forward.
• Signed types have a special sign bit and can interpret this using three different encodings to represent negative values ​​(one and two additions or a sign and a value).

Answer 2

, . , .

, 8- 8 , 0..255 ( , -128 +127).

Answer 3

.

, .

Answer 4

.

C 3 : , .

, -1:

• |1000|0000|0000|0001| 16- .
• |1111|1111|1111|1110| 16- .
• |1111|1111|1111|1111| 16- .

, -1 & 3 3 :

• 1 ,
• 2 ,
• 3 ,

, << >>, DS9K.

, , ( ).