学习vector总结

# include<vector>
# include<iostream>
# include<cstdio>
# include<algorithm>
using namespace std;
int main(int argc, const char * argv[])
{
    //vector容器的定义三种
    //(1)  vector<int>v
    //(2)  vector<double>v(3)用来存储3的double型的容器
    //(3)  vector<int>(10,8.7)用来存储10个装有8.7的容器

    //vector<int>v(3);//其中的3为元素的个数
    //v.push_back(1);//给其中加入1，现在v中就有 0 0 0 1 即四个数
    //v.push_back(2);//push_back的作用是给其中的v加入后缀
    //v.push_back(3);

    /*-----------------------------------------------------*/
    //vector<int>v(3);
    //v[0] = 2;
    //v[1] = 3;
    //v[2] = 4;
    //vector<int>::iterator it;
    //for(it = v.begin(); it!=v.end(); it++) //遍历
    //{
    //    cout<<*it<<" ";
    //}
    //cout<<endl;

    /*-------------------------------------------------------*/
    //insert
    //vector<int>v(3);
    //v[0] = 2;
    //v[1] = 7;
    //v[2] = 9;
    //v.insert(v.begin(),8);
    //v.insert(v.begin()+2,1);
    //v.insert(v.end(),3);
    //vector<int>::iterator it;
    //for(it = v.begin(); it!=v.end(); it++)
    //{
    //   cout<<*it<<" ";
    //}
    //cout<<endl;

    /*------------------------------------------------------*/
    //erase()
    //vector<int>v(10);
    //for(int i = 0;i < 10;i++)
    //{
    //    v[i] = i;
    //}
    //v.erase(v.begin()+2);
    //vector<int>::iterator it;
    //for(it = v.begin();it!=v.end();it++)
    //{
    //    cout<<*it<<" ";
    //}
    //cout<<endl;
    //v.erase(v.begin()+1,v.begin()+5);
    //for(it = v.begin();it!=v.end();it++)
    //{
    //    cout<<*it<<" ";
    //}
    //cout<<endl;
    //v.clear();
    //cout<<v.size()<<endl;

    /*---------------------------------------------------*/
    //reverse
    //vector<int>v(10);
    //for(int i = 0;i < 10;i++)
    //{
    //    v[i] = i;
    //}
    //reverse(v.begin(),v.end());
    //vector<int>::iterator it;
    //for(it = v.begin();it!=v.end();it++)
    //{
    //    cout<<*it<<" ";
    //}
    //cout<<endl;

    /*-------------------------------------------*/
    //sort    //当然也可以写一个sort函数cmp   调用格式同sort(v.begin(),v.end(),cmp);
    // vector<int>v;
    //int i;
    // for(i = 0;i < 10;i++)
    // {
    //    v.push_back(9-i);
    // }
    //for(i = 0;i < 10;i++)
    //{
    //  cout<<v[i]<<" ";
    //}
    //cout<<endl;
    //sort(v.begin(),v.end());
    //for(i = 0;i < 10;i++)
    //{
    //   cout<<v[i]<<" ";
    //}
    //cout<<endl;

    /*-----------------------------------------------*/
    //size
    vector<int>v(10);
    for(int i = 0; i < 10; i++)
    {
        v[i] = i;
    }
    cout<<v.size()<<endl;
    cout<<v.empty()<<endl;
    v.clear();
    cout<<v.empty()<<endl;

    return 0;
}