C++/Vector/vector front

Demonstrating the STL vector front and erase operations.

<source lang="cpp">

1. include <iostream>
2. include <vector>
3. include <string>

using namespace std;

int main() {

 string s("abcdefghij");
 vector<char> vector1(s.begin(), s.end());
 cout << "Popping characters off the front produces: ";
 while (vector1.size() > 0) {
   cout << vector1.front();
   vector1.erase(vector1.begin());
 }
 cout << endl;
 return 0;

} /* Popping characters off the front produces: abcdefghij

*/        
 </source>

Get the first element in a vector

<source lang="cpp">

1. include <iostream>

using std::cout; using std::endl;

1. include <vector> // vector class-template definition
2. include <algorithm> // copy algorithm
3. include <iterator> // ostream_iterator iterator
4. include <stdexcept> // out_of_range exception

int main() {

  int array[ 6 ] = { 1, 2, 3, 4, 5, 6 };
  std::vector< int > integers( array, array + 6 );
  std::ostream_iterator< int > output( cout, " " );
  integers.push_back( 2 );
  integers.push_back( 3 );
  integers.push_back( 4 );
  cout << "Vector integers contains: ";
  std::copy( integers.begin(), integers.end(), output );
  cout << "\nFirst element of integers: " << integers.front();
  return 0;

} /* Vector integers contains: 1 2 3 4 5 6 2 3 4 First element of integers: 1

*/        
 </source>