实验1.1熟悉string和vector

#include <iostream>
#include <string>
#include <vector> 
int main() {
    using namespace std;
    string s1;
    string s2{"c plus plus"};
    string s3{s2};
    string s4=s2;
    
    s1="oop";
    vector<string>v1;
    v1.push_back(s1);
    v1.push_back(s2+"1");
    v1.push_back(s3+"2");
    v1.push_back(s4+"3");
    
    cout<<"output1: "<<endl;
    for(auto item: v1){
        cout<<item<<endl;
    }
    
    cout<<"output2: ";
    for(auto p=v1.begin();p!=v1.end();++p){
        cout<<*p<<endl;
    }
    
    cout<<"output3: ";
    for(auto i=0;i<v1.size();++i){
        cout<<v1[i]<<endl;
    }
    vector<string>v2{v1.rbegin(),v1.rend()};
    cout<<"v2: "<<endl;
    for(auto item:v2){
        cout<<item<<endl;
    }
}