using namespace std;int main() { string food = "披萨"; string* ptr = &food; // 输出 food 的值 cout << food << "\n"; // 输出food的内存地址 cout << &food << "\n"; // 访问 food 的内存地址并输出其值 cout << *ptr << "\n"; // 修改指针的值 *ptr = "汉堡"; // 输出指针的新值 cout << *ptr << "\n"; // 输出 food 变量的新值 cout << food << "\n"; return 0;}