This exercise implements a number guessing game were the user guesses a number between a lower and upper limit.
My Code
Main
public class Main {
public static void main(String[] args) {
// test your program here
GuessingGame game = new GuessingGame();
game.play(0, 100);
}
}
GuessingGame
import java.util.Scanner;
public class GuessingGame {
private Scanner reader;
public GuessingGame() {
// use only this scanner, othervise the tests do not work
this.reader = new Scanner(System.in);
}
public void play(int lowerLimit, int upperLimit) {
instructions(lowerLimit, upperLimit);
// write the guessing logic here
boolean loop = true;
while (loop) {
if (isGreaterThan(average(lowerLimit, upperLimit))) {
lowerLimit = average(lowerLimit, upperLimit) +1;
} else {
upperLimit = average(lowerLimit, upperLimit);
}
if (lowerLimit == upperLimit) {
loop = false;
}
}
System.out.println("The number you're thinking of is " + upperLimit + ".");
}
// implement here the methods isGreaterThan and average
public void instructions(int lowerLimit, int upperLimit) {
int maxQuestions = howManyTimesHalvable(upperLimit - lowerLimit);
System.out.println("Think of a number between " + lowerLimit + "..." + upperLimit + ".");
System.out.println("I promise you that I can guess the number you are thinking with " + maxQuestions + " questions.");
System.out.println("");
System.out.println("Next I'll present you a series of questions. Answer them honestly.");
System.out.println("");
}
// a helper method:
public static int howManyTimesHalvable(int number) {
// we create a base two logarithm of the given value
// Below we swap the base number to base two logarithms!
return (int) (Math.log(number) / Math.log(2)) + 1;
}
public boolean isGreaterThan(int value) {
System.out.println("Is your number greater than " + value + "? (y/n)");
String answer = reader.nextLine();
if (answer.contentEquals("y")) {
return true;
} else {
return false;
}
}
public int average(int firstNumber, int secondNumber) {
return (firstNumber + secondNumber) / 2;
}
}
Model Code
Main
public class Main {
public static void main(String[] args) {
// test your program here
GuessingGame game = new GuessingGame();
game.play(0, 100);
}
}GuessingGame
import java.util.Scanner;
public class GuessingGame {
private Scanner reader;
public GuessingGame() {
// use only this scanner, othervise the tests do not work
this.reader = new Scanner(System.in);
}
public void play(int lowerLimit, int upperLimit) {
instructions(lowerLimit, upperLimit);
// write the guessing logic here
while (lowerLimit < upperLimit) {
int middle = average(lowerLimit, upperLimit);
if (isGreaterThan(middle)) {
lowerLimit = middle + 1;
} else {
upperLimit = middle;
}
}
System.out.println("The number you're thinking of is " + lowerLimit);
}
// implement here the methods isGreaterThan and average
public boolean isGreaterThan(int luku) {
System.out.println("Is your number greater than " + luku + "? (y/n)");
String answer = this.reader.nextLine();
return answer.equals("y");
}
public int average(int first, int second) {
return (first + second) / 2;
}
public void instructions(int lowerLimit, int upperLimit) {
int maxQuestions = howManyTimesHalvable(upperLimit - lowerLimit);
System.out.println("Think of a number between " + lowerLimit + "..." + upperLimit + ".");
System.out.println("I promise you that I can guess the number you are thinking with " + maxQuestions + " questions.");
System.out.println("");
System.out.println("Next I'll present you a series of questions. Answer them honestly.");
System.out.println("");
}
// a helper method:
public static int howManyTimesHalvable(int number) {
// we create a base two logarithm of the given value
// Below we swap the base number to base two logarithms!
return (int) (Math.log(number) / Math.log(2)) + 1;
}
}
Comments
I think their solution is better but only because of it readability, not it’s functionality. Again I have an added variable to the model code.