insert and erase. : vector erase « vector « C++ Tutorial

1. C++ Tutorial
2. vector
3. vector erase

#include <iostream>
#include <vector>
using namespace std;
   
int main()
{
  vector<char> v(10);
  vector<char> v2;
  char str[] = "<Vector>";
  unsigned int i;
   
  for(i=0; i<10; i++) v[i] = i + 'a';
   
  // copy characters in str into v2
  for(i=0; str[i]; i++) 
     v2.push_back(str[i]);
 
  // display original contents of vector
  cout << "Original contents of v:\n";
  for(i=0; i<v.size(); i++) cout << v[i] << " ";
  cout << "\n\n";
   
  vector<char>::iterator p = v.begin();
  p += 2; // point to 3rd element
   
  // insert 10 X's into v
  v.insert(p, 10, 'X');
   
  // display contents after insertion
  cout << "Size after inserting X's = " << v.size() << endl;
  cout << "Contents after insert:\n";
  for(i=0; i<v.size(); i++) cout << v[i] << " ";
  cout << "\n\n";
   
  // remove those elements
  p = v.begin();
  p += 2; // point to 3rd element
  v.erase(p, p+10); // remove next 10 elements
   
  // display contents after deletion
  cout << "Size after erase = " << v.size() << endl;
  cout << "Contents after erase:\n";
  for(i=0; i<v.size(); i++) cout << v[i] << " ";
  cout << "\n\n";
   
  // Insert v2 into v
  v.insert(p, v2.begin(), v2.end());
  cout << "Size after v2's insertion = ";
  cout << v.size() << endl;
  cout << "Contents after insert:\n";
  for(i=0; i<v.size(); i++) cout << v[i] << " ";
  cout << endl;
   
  return 0;
}