left shift count >= width of type [enabled by default]
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今天在使用sizeof宏的时候发现了sizeof的一个小缺陷。现象如下：
经过查阅，发现是位移运算符的限制导致的。
语法如下：位移计数（直白点就是需要移动的位数）必须大于或者等于0，而且要小于那个位移对象的长度n。加上这个限制主要是为了能够在硬件上高效的实现位移运算。
举个栗子：在一个32位系统中，int数据类型为32位，如果要移动一个int类型的数，那么最多只能移动31位！
上面的程序更改如下：
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