指针是一个地址，他自己也是有一个地址。一级指针（带一个*号）表示一级地址，他自身地址为二级地址。二级指针（带两个*号）表示二级地址，他自身地址为三级地址。- The pointer is an address, and he himself also has an address. A pointer (with a* number), said the first level address, his own address for the two level address. Tw