Modified Guess

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <sstream>

using namespace std;

int main()
{
    cout << "\tWelcome to Guess My Number!\n\n";

    // Initialization that is done before the game is started
    char playAgain = 'y';
    int level;
    srand(time(0)); // seed the random number generator - we only need to do this once

    const int NUM_LEVELS = 4;
    int levelRanges[NUM_LEVELS] = {100, 1000, 5000, 25000};

    do
    {
    cout << "Difficulty Selection: \n\n";
    cout << "1 - Easy\n2 - Normal\n3 - Hard\n4 - Unbeatable\n\n";
    cin >> level;
    cout << "\nYou chose level " << level << "\n\n";

    // NOTE:  DOES NOT CHECK ARRAY BOUNDARIES!
    int theNumber = rand() % levelRanges[level-1] + 1; // random number between 1 and the specified range
    int tries = 0, guess;

    do
    {
        cout << "Enter a guess: ";

        string str;
        cin >> str;
        istringstream iss(str);
        iss >> guess ;
        if (iss.eof() == false)
        cout << "\n\nPlease enter only numbers.\n\n";
        else
        {

        ++tries;

        if (guess > theNumber)
            cout << "Too high!\n\n";

        if (guess < theNumber)
            cout << "Too low!\n\n";
        }

    } while (guess != theNumber);

    cout << "\nThat's it! You got it in " << tries << " guesses!\n";

    cout << "Play again? (y/n)\n";
    cin >> playAgain;

    } while (playAgain == 'y');

    return 0;
}