#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
using namespace std;
#include <string>

/*
存取字符串
char& operator[](int n);//通过[]方式取字符
char& at(int n);//通过at方法获取字符

*/
void test01()
{
    string s = "hello world";
    for (int i = 0; i < s.size(); i++)
    {
        //cout << s[i] << endl;   //char& operator[](int n);
        cout << s.at(i) << endl;//char& at(int n)
    }
}

int main()
{
    test01();
    system("Pause");
    return 0;
}