如何使用按位运算符将位与C中的无符号整数隔离？

Question

this seems to be working well for me except this one time. I'm trying to get the first 10 bits of this number

unsigned char c= 17512807u<<22>>22;

I expect this to be 359 or 0101100111 but I'm getting 103 or 0001100111. Is there a reason that this is happening?

Answer 1

The result you are getting is correct due to the truncation to 8-bit unsigned char value (when assigning to c ).

If you need a value that is 10-bits wide you should use a different datatype, like uint16_t or an unsigned int .

Reference to C++ integer datatypes