Exercise NumberGuess: Write a program called NumberGuess to play the number guessing game. The program shall generate a random number between 0 and 99. The player inputs his/her guess, and the program shall response with "Try higher", "Try lower" or "You got it in n trials" accordingly. For example: java NumberGuess Key in your guess: 50 Try higher 70 Try lower 65 Try lower 61 You got it in 4 trials! Hints: Use Math.random() to produce a random number in double between 0.0 and (less than) 1.0. To produce an int between 0 and 99, use: int secretNumber = (int)(Math.random()*100);
Exercise Fibonacci (Overflow): Write a
F(0) = 1
F(1) = 1
F(2) = 2
...
F(45) = 1836311903
F(46) is out of the range of int
Hints: The maximum 32-bit int is kept in constant Integer.MAX_VALUE. You cannot use F(n-1) + F(n-2) > Integer.MAX_VALUE to check for overflow. Instead, overflow occurs for F(n) if (Integer.MAX_VALUE – F(n-1)) < F(n-2), i.e., no room for the next number.
Try: Write a similar program for Tribonacci numbers.
Exercise NumberConversion: Write a method call toRadix() which converts a positive integer from one radix into another. The method has the following header:
public static String toRadix(String in, int inRadix, int outRadix) // The input and output are treated as String.
Write a program called NumberConversion, which prompts the user for an input number, an input radix, and an output radix, and display the converted number. The output shall look like:
Enter a number and radix: A1B2
Enter the input radix: 16
Enter the output radix: 2
"A1B2" in radix 16 is "1010000110110010" in radix 2.
Exercise NumberGuess: Write a program called NumberGuess to play the number guessing game. The program shall generate a random number between 0 and 99. The player inputs his/her guess, and the program shall response with "Try higher", "Try lower" or "You got it in n trials" accordingly. For example:
java NumberGuess
Key in your guess:
50
Try higher
70
Try lower
65
Try lower
61
You got it in 4 trials!
Hints: Use Math.random() to produce a random number in double between 0.0 and (less than) 1.0. To produce an int between 0 and 99, use:
int secretNumber = (int)(Math.random()*100);
Exercise WordGuess: Write a program called WordGuess to guess a word by trying to guess the individual characters. The word to be guessed shall be provided using the command-line argument. Your program shall look like:
java WordGuess testing
Key in one character or your guess word: t
Trial 1: t__t___
Key in one character or your guess word: g
Trial 2: t__t__g
Key in one character or your guess word: e
Trial 3: te_t__g
Key in one character or your guess word: testing
Congratulation!
You got in 4 trials
Hints:
- Set up a boolean array to indicate the positions of the word that have been guessed correctly.
- Check the length of the input String to determine whether the player enters a single character or a guessed word. If the player enters a single character, check it against the word to be guessed, and update the boolean array that keeping the result so far.
- Try retrieving the word to be guessed from a text file (or a dictionary) randomly.
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