1.表示的含义不一样：*p表示此指针指向的内存地址中存放的信息。p表示一个指针变量的名字，指此指针变量所说向的内存地址。
2.输出的格式不一样：*p一般是一个和指针类型统一的变量或者常量。p输出的是个16进制数，输出一个指针的地址。
3.功能不一样：*p是让程序去那个地址取出数据。p存放的是地址。
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