101000001010(10进制)——>1011110000100000100011011010111110010(2进制)
15(10进制)——>1111(2进制)
1011110000100000100011011010111110010(2进制)
& 0000000000000000000000000000000001111(2进制)
——————————————————————————
0000000000000000000000000000000000010(2进制)——>2(10进制) |
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