Question

因此，对于我的java类，我们必须猜测用户在想什么号码，介于0和1024之间。我们必须猜测10个猜测中的数字。我不能在10个猜测中得到奇数，我只能在11中得到它们。这就是我到目前为止所做的：

import java.util.Scanner;

public class guessing_game {

public static void main(String[] args) {
    int high, low, middle;
     String input;
    int totalGuesses;
    high = 1024;
    low = 0;
    totalGuesses = 0;
    String name;

    System.out.println("What is your name?");
        Scanner scan = new Scanner(System.in);
        name = scan.nextLine();

        middle = low + (high - low) / 2;
    System.out.println("Is your number higher than " + middle + ", " + name + "? Please answer 'y' or 'n'. ");
    System.out.println("If I guess the number, either answer 'that is my number' or answer 'n'.");
        totalGuesses++;
        Scanner sca = new Scanner(System.in);
        input = sca.nextLine();

        while (high - low != 1){
if (input.equals("y")){
            low = middle;
        middle = low + (high - low) / 2;
    System.out.println("Okay, let's try again.");
    System.out.println("Is your number higher than " + middle + ", " + name + "? ");
        input = sca.nextLine();
        totalGuesses++;}
if (input.equals("that is my number")){
    System.out.println("Great! Your number is " + middle + ". ");
    break;}


else if (input.equals("n")){
            high = middle;
        middle = low + (high - low) / 2;
    System.out.println("Alright, I'll try again.");
    System.out.println("Is your number higher than " + middle + ", " + name +  "? ");
        input = sca.nextLine();
        totalGuesses++;}
if  (high - low == 1){
    System.out.println("Number is " + high);
    break;}
if (high - low == 2){
    System.out.println("Your number is " + high);
    break;}}

    System.out.println("This guessing game program used " + totalGuesses + " guesses.");
    sca.close();
    scan.close();

     }

这是我的教授给我提供的p-code代码，文字帮助：

import java.util.Scanner;

Start of main method
    integer high,low,middle;
    String input;
    integer totalGuesses;
    high = 1024;
    low = 0;
    totalGuesses = 0;

    start infinite loop
        middle = low + (high - low)/2
        print "Is your number higher than " + middle + " ? (y/n)"
        increment totalGuesses by 1
        read from keyboard into input
        if input is “y”
            low = middle
            middle = low + (high - low)/2               
            if (high - low) == 1
                print "Your number is " + high
                exit the infinite loop

        else
            high = middle
            middle = low + (high - low)/2
            if (high - low) == 1
                print "Your number is " + low
                exit the infinite loop



    print "The program used " + totalGuesses + " guesses"

end of method

课程结束

Answer 1

如果middle = low + (high - low) / 2;是奇数，

high - low将无法正确评估。由于除法发生在整数运算中，结果将是截断。

Java猜测游戏无法在10个猜测中猜出奇数

1 个答案: