#include <iostream>

using namespace std;

int main() {

    string food = "Pizza"; // A food variable of type string

    cout << "Output value and address by variable and reference" << endl;
    cout << food << endl;  // Outputs the value of food (Pizza)
    cout << &food << endl; // Outputs the memory address of food (0x6dfed4)

    // 定义指针
    cout << "Output value and address by pointer" << endl;
    string* ptr = &food;
    cout << *ptr << endl;
    cout << ptr << endl;

    // 修改指针指向内存的值
    cout << "Modify value by pointer" << endl;
    *ptr = "Hamburger";
    // 指针指向变量的值也被改变了
    cout << food << endl;
    
}