java - 随机数猜谜游戏的逻辑错误

Question

在此程序中，计算机生成一个随机数(1-100 之间)，然后用户尝试猜测它。运行直到用户正确猜出数字。需要打印出在正确猜出数字之前所进行的总尝试次数。程序运行正常，但存在逻辑错误。当我正确猜出数字时，什么也没有打印出来；程序只是停止了。

import java.util.*;
public class Problem3 {


  public static void main(String[] args) { 

    Random rand = new Random();
    Scanner console = new Scanner(System.in);

    int num = rand.nextInt(100)+1;
    System.out.println(num); //prints out the random number so I know test works correctly
    int count = 0;
    System.out.println("Guess the random number. The number is between 1 and 100. Enter it below");
    console = new Scanner(System.in);
    int guess = console.nextInt();
    while(guess != num){  //while guess is not = to number  
      if(guess < num){             //if less than num
        System.out.println("Your guess is too low"); 
        System.out.println("Guess the random number. The number is between 1 and 100. Enter it below");
        guess = console.nextInt();
        count++;
      }else if( guess > num){      //if greater than num   
          System.out.println("Your guess is too high");
          System.out.println("Guess the random number. The number is between 1 and 100. Enter it below");
          guess = console.nextInt();
          count++;
      }else{
        count++;
        System.out.println("You guessed correctly after " + count + " tries!");
    }
    }
  }

}

Answer 1

实际上你永远不会进入else阶段，因为当猜出数字时，while代码不会执行，因此else代码永远不会执行。因此，在猜测数字之后，条件为 false，退出 while 循环和 System.out.print Congrats 消息

将其放在 while 循环之外“最后”:

 System.out.println("You guessed correctly after " + count + " tries!");

您的代码应如下所示:

while(guess != num){  //while guess is not = to number  
      if(guess < num){             //if less than num
        System.out.println("Your guess is too low"); 
        System.out.println("Guess the random number. The number is between 1 and 100. Enter it below");
        guess = console.nextInt();
        count++;
      }else{      //if greater than num   
          System.out.println("Your guess is too high");
          System.out.println("Guess the random number. The number is between 1 and 100. Enter it below");
          guess = console.nextInt();
          count++;
      }
    }

  System.out.println("You guessed correctly after " + ++count + " tries!");