text: #include <iostream>
  using namespace std;
  
  int main()
  {
      // while, execute while condition
      while (false)
          cout << "don't execute";
  
      // do-while, execute at least once while condition
      do
          cout << "execute once" << endl;
      while (false);
  
      // for, execute with counter condition
      for (int i = 0; i < 2; i++)
          cout << i;
  }
  