迭代器vector的访问与使用

一、访问vector的第个元素

#include
using namespace std;
int main()
{
	string s("some thing");
	if(s.begin()!=s.end())
	{
		auto it=s.begin();
		*it=toupper(*it);
		//for(decltype(s.size()) i=0;i!=s.size()-1;++i)
		int i=3;
		cout<

说明:auto *it=s.begin();  //*it是解引用

*it=s.begin()[0];

#include
#include
using namespace std;

void main()
{
	vector coll;

	for (int i = -3; i < 9; ++i){
		coll.push_back(i);
	}

	cout << "number/distance:" << coll.end() - coll.begin() << endl;

	vector::iterator pos;//迭代器
	for (pos = coll.begin(); pos < coll.end(); ++pos)
		cout << *pos << "\t";
	cout << endl;

	for(decltype(coll.size()) i = 0; i < coll.size(); ++i)
		cout << coll.begin()[i] << "\t";//coll.begin[i]d
	cout << endl;

	//for (pos = coll.begin(); pos < coll.end() - 1; pos += 2)
	//	cout << *pos << "\t";
	//cout << endl;
}