2015级C++第14周程序阅读 STL中的简单容器和迭代器

阅读并运行程序，解释程序执行得到的结果

(1)

#include<iostream>
#include<vector>
#include<iterator>
using namespace std;
int main()
{
    vector<int> ivec;
    int i;
    for(i = 0; i < 5; i++ )
        ivec.push_back(i);
    for(i = 0; i < 5; i++)
        cout<<ivec[i]<<"  ";
    cout<<endl;
    while( !ivec.empty())
    {
        cout << ivec.back() << "  ";
        ivec.pop_back();
    }
    cout << endl;
    for(i = 0; i < 5; i++)
        cout<<ivec[i]<<"  ";
    cout<<endl;
    copy(ivec.begin(),ivec.end(),ostream_iterator<int>(cout, "  "));
    cout<<endl;
    cout << "size=" << ivec.size() << endl;
    return 0;
}

(2)

#include <iostream>
#include <vector>
using namespace std;
int main()
{
    vector<int> intList;
    vector<int>::iterator listIt;
    int i;
    intList.push_back(1);
    intList.push_back(5);
    intList.push_back(10);
    intList.push_back(15);
    cout<<"Line 1: List Elements: ";
    for(i=0; i<4; i++)
        cout<<intList[i]<<"    ";
    cout<<endl;
    for(i=0; i<4; i++)
        intList[i] *=2;
    cout<<"Line 2: List Elements: ";
    for(listIt=intList.begin(); listIt != intList.end(); ++listIt)
        cout<<*listIt<<"    ";
    cout<<endl;
    listIt=intList.begin();
    ++listIt;
    ++listIt;
    intList.insert(listIt,8);
    cout<<"Line 3: List Elements: ";
    for(listIt = intList.begin(); listIt != intList.end(); ++listIt)
        cout<<*listIt<<"    ";
    cout<<endl;
    return 0;
}

(3)

#include <iterator>
#include <list>
#include <algorithm>
#include <iostream>
using namespace std;
int main()
{
    int ia[5] = {1,2,3,4};
    list<int> id(ia, ia+4);
    ostream_iterator<int> outite(cout, " ");
    copy(id.begin(), id.end(), outite);
    cout << endl;
    copy(ia+1, ia+2, front_inserter(id));
    copy(id.begin(), id.end(), outite);
    cout << endl;
    copy(ia+3, ia+4, back_inserter(id));
    copy(id.begin(), id.end(), outite);
    cout << endl;
    list<int>::iterator ite = find(id.begin(), id.end(), 3);
    copy(ia+0, ia+2, inserter(id, ite));
    copy(id.begin(), id.end(), outite);
    cout << endl;
    copy(id.rbegin(), id.rend(), outite);
    cout << endl;
    return 0;
}