#include<iostream>
using namespace std;
#include"vector"


//输出(放在main函数里面出错 为什么？？？？？？？？)
//因为函数里面不能定义函数！！！
void printV(vector<int> &obj)
{
	for (int i = 0; i < obj.size(); i++)
	{
		cout << obj[i] << " ";
	}
	cout << endl;
}
int main()
{
	vector<int> v1;
	v1.push_back(1);
	v1.push_back(3);
	v1.push_back(5);
	cout <<" v1 的大小是： " <<  v1.size() << endl;
	cout << "v1 的 头部元素是 ：" << v1.front() << endl;
	//更改头尾部元素 
	v1.front() = 11;
	v1.back() = 22;
	while (v1.size() != 0)
	{
		cout << "尾部元素为 ： " << v1.back() << " ";
		v1.pop_back();//删除尾部元素
	}
	cout << endl<< "  删除后 v1 的大小是： " << v1.size() << endl;

	vector<int>v11 = {1,2,3};
	//初始化
	vector<int> v2 = v11;
	vector <int > v3(v11.begin(), v11.end());
	cout << "v2 is :";
	printV(v2);
	cout << "v3 is :";
	printV(v3);

	vector<int > a1(10);//这里必须分配数组内存，否则不能进行赋值运算。
	for (int i = 0; i < 10; i++)
	{
		a1[i] = i + 1;
	}
	cout << "a1 is :";
	printV(a1);

	system("pause");
}