7.字符串插入和删除

#include<iostream>
using namespace std;

void test0701()
{
    string str1 = "hello";

    //插入
    str1.insert(1, "111");
    cout << "str1=" << str1 << endl;

    //删除
    str1.erase(1, 3);
    cout << "str1=" << str1 << endl;

}

int main()
{

    test0701();

    system("pause");
    return 0;
}