Java 基础高 :Low Guessing Game Help (Loops)

Question

我已经停止编程有一段时间了。大概四年左右，我只是想玩玩它，所以我决定制作一个高:低的猜数字游戏。 (猜一个数字 1-100，程序会提示你的猜测是否太高或太低)，我完全忘记了我将如何进行:

a) 一旦用户猜出正确的数字，询问他们是否想再玩一次b) 如果他们没有猜出正确的数字(太高或太低)，程序会让他们再次猜测。

我知道你需要循环，但我只是忘记了如何处理它们

package highlow;

import java.util.Random;
import java.util.Scanner;

public class guessing {
    public static void main(String[] args){

        Scanner input = new Scanner(System.in);

        Random rand = new Random();
        int tries;
        int correctNum = rand.nextInt(100);

        System.out.println("enter a number 1-100");
        int guess1 = input.nextInt();

        if(guess1 < correctNum){
            System.out.println("number is too low!");
        }
        else if(guess1 > correctNum){
            System.out.println("Number is too high!");
        }
        else if(guess1 == correctNum){
            System.out.println("correct!");
        }
        else{
            System.out.println("not a valid option");
        }


    }

}

Answer 1

您需要将所有内容包装在 while 循环中，以便它不断重复，直到用户猜对为止:

// Make the scanner, get the random number etc... Put all the setup and
// stuff you don't want to be repeated here

while (true) {
    System.out.println("enter a number 0-99"); // Changed from 1-100 because rand.nextInt(100)
                                               // returns a number between 0 and 99
                                               // You can do correctNum += 1 to make it between 1 and 100
                                               // But put this in before the while loop starts
    int guess1 = input.nextInt();

    if(guess1 < correctNum){
        System.out.println("number is too low!");
    }
    else if(guess1 > correctNum){
        System.out.println("Number is too high!");
    }
    else if(guess1 == correctNum){
        System.out.println("correct!");
        break; // <---- Add this, this will make the loop stop when the 
               //player gets the answer correct and therefore the program will end
    }
    else{
        System.out.println("not a valid option");
    }
}

While 循环重复其内部的所有内容，直到其 () 内的语句为 false。在我们的例子中，循环将永远进行，因为 true 位于 () 内部，但使用 break 语句，当用户猜测时循环将结束正确。