Program Logic and Indefinite Loops - Building Java Programs: A Back to Basics Approach - page 355

39 // pre: number and guess are unique two-digit numbers
40 public static int matches( int number, int guess) {
41 int numMatches = 0;
42
43 if (guess / 10 == number / 10 ||
44 guess / 10 == number % 10) {
45 numMatches++;
46 }
47
48 if (guess / 10 ! = guess % 10 &&
49 (guess % 10 == number / 10 ||
50 guess % 10 == number % 10)) {
51 numMatches++;
52 }
53
54 return numMatches;
55 }
56
57 // prompts until a number in proper range is entered
58 // post: guess is between 0 and 99
59 public static int getGuess(Scanner console) {
60 int guess = getInt(console, "Your guess? ");
61 while (guess < 0 || guess >= 100) {
62 System.out.println("Out of range; try again.");
63 guess = getInt(console, "Your guess? ");
64 }
65
66 return guess;
67 }
68
69 // prompts until a valid number is entered
70 public static int getInt(Scanner console, String prompt) {
71 System.out.print(prompt);
72 while (!console.hasNextInt()) {
73 console.next(); // to discard the input
74 System.out.println("Not an integer; try again.");
75 System.out.print(prompt);
76 }
77 return console.nextInt();
78 }
79 }