8.string子串

#include<iostream>
using namespace std;

#include<algorithm>

//string求子串
void test0801()
{
    string str1 = "abcdef";

    string subStr = str1.substr(1, 3);

    cout << "subStr=" << subStr << endl;
}
//实用操作
void test0802()
{
    string email = "hello@sina.com";

    int pos=email.find('@');

    string user = email.substr(0, pos);
    cout << "user=" << user << endl;

    sort(user.begin(), user.end());//升序排序
    cout << "user=" << user << endl;
}

int main()
{
    test0801();
    test0802();

    system("pause");
    return 0;
}