#include <iostream>
#include <cstdio>
using namespace std;
int ifansn()
{
  cout << "You don't want to download and install upgrade.\n";
  cout << "Exiting...";
  return 0;
}
int ifansn2()
{
  cout << "#Installation canceled by user\n";
  cout << "#Exiting...";
  return 0;
}
int ifansy2()
{
  char* nothing;
  cout << "#Updates installing...\n";
  cout << "#.......30%";
  cout << "#................50%";
  cout << "#.................................100%";
  cout << "#Great! Update installed, need reboot!";
  cin >> nothing;
}
int ifansy()
{
  char* otv2;
  cout << "#Great! Wait, while update downloading...\n";
  cout << "#...";
  cout << "............50%";
  cout << "....................86%";
  cout << "........................100%\n";
  cout << "#Update download! You want to install it?\n";
  cout << "#Y or N\n";
  cout << "#";
  cin >> otv2;
  if((otv2="Y") || (otv2="y"))
  {
    ifansy2();
  }
  if((otv2="N") || (otv2="n"))
  {
    ifansn2();
  }


}

int main()
{
  bool prov;
  char* otv;
  cout << "#Welcome to updater of DoubleOS\n";
  cout << "#If you want update OS to version 5.1.5\n";
  cout << "#Press Y, then press Enter\n";
 tochka: cout << "#If you don't want install update, press N, then Enter\n";
  cout << "#";
  cin >> otv;
  if((otv="Y") ||(otv="y"))
  {
    prov=true;
  }
  else if((otv="N") ||(otv="n"))
  {
    prov=false;
  }
  if(prov=true)
  {
    ifansy();
  }
  else if(prov=false)
  {
    ifansn();
  }
  else
  {
    cout << "I don't know this command!";
    goto tochka;
  }
   return 0;
}