Some operations of bit operation

Bitwise AND & The operation is usually used to clear some bits of a number or reserve some bits
for example ： hold a The height of 8 A reset
a & 0000000011111111
Also is to a & 255 After the operation , Will realize the number a The height of 8 Bit is cleared

Exclusive or ^ Purpose of operation ：
Flip certain bits
For example, logarithm 0x10100001 Of the 2 And the 3 Bit flip operation , that
Sure 0x10100001 ^ 0x00000110
Through bitwise XOR operation, the exchange of two numbers can be realized
For example, exchange A and B
A=0x10100001    B=0x00000110
A=A^B        A=10100111
B=A^B        B=10100001
A=A^B        A=00000110
Some operations of bit operation ：
1、     Multiplication and division 2 
Numbers A Move left n Who said A*2^n
Numbers A Move right n Who said A/2^n
2、     Judge parity
Because if a digit is odd , Then the last one must be 1, All and 1 Carry out the positioning & operation , Must be 1, It can be judged to be an odd number , If the result is 0 Then it's even
0x00010000
&
0x00000001
Int a = 16;
Int b= 25;
If(a & 1)
     Odd number
Else
     even numbers