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The last group of operators are called bitwise operators because the operations are performed bitwise. It simply means that a logic operation is performed for each bit of two numbers. The result is a new number – the total result of the bitwise operations.
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Example:
15 & 8
Result:
8
Since this operation is bitwise the calculation will be per bit. So to understand what’s going on here, you have to convert the numbers to binary values:
15 = 1111 8 = 1000
Now each bit in the number 1111 (15) can be used in a logical operation with the other number 1000 (8): 1111 AND 1000
Bit number 
1111 (15) 
1000 (8) 
Result 
0 
1 
0 
0 
1 
1 
0 
0 
2 
1 
0 
0 
3 
1 
1 
1 