c++ vector指针访问vector元素的两种方法

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 方法一：使用指针

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

int main()
{
	vector<string>* str;
	vector<string> s;
	str = &s;
	str->push_back("123");
	str->push_back("456");
	cout << str->back() << endl;
	str->pop_back();
	size_t size = str->size();
	for (size_t i = 0; i < size; i++)
	{
		cout << str->at(i) << endl;
	}
}

方法二：使用迭代器 

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

int main()
{
	vector<int> s;
	vector<int> *p = &s;
	s.push_back(1);
 
	for (vector<int>::iterator it = p->begin(); it != p->end(); it++)
		cout << *it<<endl;    //使用迭代器，正确
 
	//cout << p[0] << endl;   //错误
    return 0;
}