string字符的存取(10)

string中单个字符存取方式有两种

char& operator[](int n); //通过[]方式取字符

char& at(int n); //通过at方法获取字符

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

void test_01()
{
    int i = 0;
    string str1 = "abcdefghijklmnopqrstuvwxyz";

    //取
    for (i; i < str1.size(); i++)
    {
        cout << str1[i] << " ";
    }
    cout << endl;

    //修改
    str1.at(0) = 'A';//注意不是“”而是‘’
    cout << str1 << endl;
}

int main(void)
{
    test_01();

    system("pause");
    return 0;

}