ex3_21.cpp

///
///Redo the first exercise from § 3.3.3 (p. 105) using iterators.
///

#include <vector>
#include <iterator>
#include <string>
#include <iostream>

using std::vector;
using std::string;
using std::cout;
using std::endl;

void check(const vector<int>& vec)
{
  if (vec.empty())
    cout << "size: 0; no values." << endl;
  else
  {
    cout << "size: " << vec.size() << "; values:";
    for (auto it = vec.begin(); it != vec.end(); ++it)
      cout << *it << ",";
    cout << "\b." << endl;
  }
}

void check(const vector<string>& vec)
{
  if (vec.empty())
    cout << "size: 0; no values." << endl;
  else
  {
    cout << "size: " << vec.size() << "; values:";
    for (auto it = vec.begin(); it != vec.end(); ++it)
      if (it->empty()) cout << "(null)" << ",";
      else cout << *it << ",";
    cout << "\b." << endl;
  }
}

int main()
{
  vector<int> v1;
  vector<int> v2(10);
  vector<int> v3(10, 42);
  vector<int> v4{10};
  vector<int> v5{10, 42};
  vector<string> v6{10};
  vector<string> v7{10, "hi"};

  check(v1);
  check(v2);
  check(v3);
  check(v4);
  check(v5);
  check(v6);
  check(v7);
    
  return 0;
}