//文件名:CHAPTER6-20.cpp
#include <vector>
#include <iostream.h>
using namespace std;
void main (void) 
{  vector<int> vector1;   // define a vector of integers
  for (int i = 0; i < 10; ++i)  
	  vector1.push_back(i);
  cout << "vector contains " << vector1.size() << " elements" << endl;
  vector1.pop_back();     // erase the last element 9
  cout << "vector contains " << vector1.size() << " elements" << endl;
  vector1.erase(vector1.begin());  // erase the first element (1) using an iterator
  cout << "vector contains " << vector1.size() << " elements" << endl;
  vector1.erase(vector1.begin(), vector1.end());  // erase all the remaining elements
  cout << "vector contains " << vector1.size() << " elements" << endl;
}