题目：取一个整数a从右端开始的4-7位。
程云计序分析：可以这样考虑：
(1)先使a右移4位。
(算开2)设置一个低4位全为1,其余全为0的数。发：可用~(~0<<4)
(3)将上面二Py者进行&运算。
程序源代码：
以上实例th输出结果为：
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