Функция rand()

void Ex()
{   srand(time(NULL));
    int first = 1;
    int last = 100;
    int number = rand() % last + 1;
    int count = 0;
    bool state = false;
    while (true)
    {
        std::cout << "Guess the number (from 1 to 100): " << number << "\n";
        std::cout << "1.You guessed" << "\n";
        std::cout << "2.Too hight" << "\n";
        std::cout << "3.Too low" << "\n";
        
        std::cin >> count;
        switch (count)
        {
        case 1: state = true;
            break;
        case 2: last = number - 1;
            break;
        case 3: first = number + 1;
            break;
        }
        if (state)
            break;
        else
            number = first + rand() % (last - first + 1);
    }
    std::cout << "Your number: " << number << "\n" ;
    system("pause");
}
int main()
{
    Ex();
    
    return 0;
}

int number = rand() % last + 1;
number = first + rand() % (last - first + 1);

do
 {
  number = Random(first, last);
  std::cout << "Guess the number (from 1 to 100): " << number << "\n";
  std::cout << "1.You guessed" << "\n";
  std::cout << "2.Too hight" << "\n";
  std::cout << "3.Too low" << "\n";
  
  std::cin >> count;
  switch (count)
  {
  case 1: state = true;
   break;
  case 2: last = number - 1;
   break;
  case 3: first = number + 1;
   break;
  }
 }while(!state)

int number = rand() % last + 1;

int Random(int first, int last) {
  return first + rand() % (last  - first);
}