位操作技巧

1. 将2’s-complement的有符号数整体转为大小关系相同的无符号数

1. 将2’s-complement的有符号数整体转为大小关系相同的无符号数

例如有带符号数(4bit):

0111, 1001, 0001, 0000, 1111, 1000

它们是从最大到最小的排列顺序。要使它们转变为相同大小关系的无符号数，则只需将最高位取反，其他位不变即可。通过下面的位操作：

for (i = 0; i < sizeof(singed_arr)/sizeof(signed_arr[0]); i++)
{
	unsigned_arr[i] = signed_arr[i] ^ (1U << (4 - 1));
}

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