vector的begin的基本操作

#include <vector>
#include <iostream>

int main()
{
	using namespace std;
	vector<int> c1;					//创建一个vector对象c1
	vector<int>::iterator c1_Iter;  //初始化一个迭代器对象
	vector<int>::const_iterator c1_cIter; //初始化一个常量迭代器对象

	c1.push_back(1);				//添加两个元素1.2
	c1.push_back(2);

	cout << "The vector c1 contains elements:";
	c1_Iter = c1.begin();			//将第一个元素的地址，赋值给迭代器

	for (; c1_Iter != c1.end(); c1_Iter++)
	{
		cout << " " << *c1_Iter;
	}
	cout << endl;

	cout << "The vector c1 now contains elements:";
	c1_Iter = c1.begin();		
	*c1_Iter = 20;				//第一个迭代器，解运算符改变了begin地址的值
	for (; c1_Iter != c1.end(); c1_Iter++)
	{
		cout << " " << *c1_Iter;
	}
	cout << endl;

}

常量迭代器无法改变vector里面的值，而普通的迭代器可以。