常用二进制计算(不定时更新)
###A - Anding an integer with 0xFF leaves only the least significant byte.
// 21845 & 0xFF
0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
& 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
-------------------------------
0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1
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