Demonstrating the four ways that vectors can be created.


#include <iostream>
#include <vector>
using namespace std;

int main()
{
  vector<char> a;         // empty
  vector<char> b(5, 'X'); // size and initialize
  vector<char> c(b);      // initialize with another vector 
  int i;

  for(i = 0; i <5; i++) 
     a.push_back('A'+i);

  // create a vector from a range
  vector<char> d(a.begin()+1, a.end()-1); 

  for(i = 0; i <a.size(); i++)
    cout << "a[" << i << "]: " << a[i] << "  ";
  cout << "\n\n";

  for(i = 0; i <b.size(); i++)
    cout << "b[" << i << "]: " << b[i] << "  ";
  cout << "\n\n";

  for(i = 0; i <c.size(); i++)
    cout << "c[" << i << "]: " << c[i] << "  ";
  cout << "\n\n";

  for(i = 0; i <d.size(); i++)
    cout << "d[" << i << "]: " << d[i] << "  ";

  return 0;
}

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Demonstrating the four ways that vectors can be created. : Vector « Data Structure « C++

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