This is a popular number guessing gamecalled"Bulls & Cows". On start up a random number is generated.Goalis to guess the number. If a digit matches its place it's a"Bull"if the digit is misplaced then it's a "Cow". For instance iftherandom number is 259 and you guessed 329, result is 1 Bull(digit9) and 1 Cow (digit 2).