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   char**p = NULL;
   *p = (unsigned char*)malloc(10);
   (*p)[0] = 'a';//正确做法
   *p[0] = 'b';//出错
   *p[0]等价于*(p[0]), 因为[]的优先级高于*
   char**p = NULL;
   *p = (unsigned char*)malloc(10);
   (*p)[0] = 'a';//正确做法
   *p[0] = 'b';//出错
   *p[0]等价于*(p[0]), 因为[]的优先级高于*