在运行以下代码时，系统报错 Operator '&' cannot be applied to 'int', 'boolean'
原因：J在ava语法中关系运算符的优先级大于逻辑运算符，所以先算(a-1) != 0得到一个boolean类型的值。&左右是布尔类型时会转换成逻辑运算符进行逻辑运算，否则会进行位运算。int & boolean操作符两边类型不一致显然不行，无法判定时进行什么运算。
正确做法是：
将a&(a-1)用小括号括成一个整体。
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