update 练习12.17 #52
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update 练习12.17 #52
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练习12.17 有点错误，因为p2是用pi2初始化的，因此实际上p2也是指向ix，等价于(d)IntP p3(&ix)
同时，规范了一下“合法”这个词的含义，即可以编译