BullsAndCows

1. Instructions are printed.
2. The user plays a game of Bulls and Cows.
3. The user is given the option to play another game or end the program.
4. Steps 2-3 repeat until the user chooses to end the program.

Rules for Bulls and Cows

1. The computer randomly generates a 4-digit number with no repeating digits.
2. The user guesses at the number (similarly entering a 4-digit number with no repeating digits).
3. The user is infomred how many bulls (correct digit in the same place as the digit in the secret number) and cows (correct digit in a different place from the digit in the secret number) they have.
4. Steps 2-3 are repeated until the user has guessed the secret number.