//int * pd = new int;
//*pd =2;
//int **a = &pd;
//int ***b = &a;
//
//cout<<"第一层 "<<*pd<<endl;
//cout<<"第一层 "<<**&pd<<endl;
//cout<<"第二层 "<<pd<<endl;
//cout<<"第二层 "<<*&pd<<endl;
//cout<<"第三层 "<<a<<endl;
//cout<<"第四层 "<<&a<<endl;
//cout<<"第四层 "<<b<<endl;
//cout<<"第五层 "<<&b<<endl;