C++ vector用法_c++ vector判断第几个元素

#include <iostream>
#include <vector>
#include<algorithm>
using namespace std;
typedef vector<int> Vector;

void printVector(Vector v)
{
   
	const int nSize = (int)(v.size());
	for(int i = 0;i < nSize;i++)
	{
   
		cout << v[i] << " ";
	}
	cout << endl;
}

int main()
{
   
	int b[7]={
   1,2,3,4,5,6,7};
	Vector a(b,b+7);
	
	cout << "------遍历a------" << endl;
	printVector(a);
	
	cout << "a返回第一元素:" << a.front() << endl;//返回第一元素
	cout << "a返回末尾元素:" 
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