第十四周项目—阅读并运行程序，解释程序执行得到的结果(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;}

运行结果：

程序分析：

 intList.push_back(1)  在尾部插入一个数据

intList.insert(listIt,8)  插入  在listIT 所指向的数之前 插入数字8