Question

我的名字是费明。我是这个论坛的新手，我也在学习Java，成为一名Java开发人员。我被困在任务上，我希望得到任何人的帮助。这是描述和代码在for块中使用if语句，确定是否randNum和guessNum相等。

public class GuessGame {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {


     int randNum , guessNum ;
     //Generates a random number from 1 to 10
     randNum = new java.util.Random().nextInt(10) + 1;
     System.out.println("Im thinking of a number from 1 to 10");

  for (guessNum = 0; guessNum <= 10; guessNum ++){

      java.util.Scanner scan = new java.util.Scanner(System.in);
      guessNum = scan.nextInt();

      if (guessNum == randNum) {
           System.out.println("you guess" + guessNum );
    }
  } 
}

}

更新了代码

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

 public class NumberGuess {

    public static void main(String[] args) {

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

        System.out.println("Im thinking of a number from 1 to 10");
        int number = scan.nextInt(10);
         //Generates a random number from 1 to 10
        int number2 = rand.nextInt(10)+1;
        System.out.println("you enter the number" + " " + number);


        for (int counter = -1; counter < 3; counter ++ ){
             if(number!= number2)
               System.out.println("and your random number is:" + " " + number2 + " " + "please try again"); 
             else 
                 System.out.println("your guess number is equal to the random number Good job guessing");

             break;
         }

    }
  }

Answer 1

for循环由guessNum变量控制。在循环中，当您执行此操作时，您将重新分配该变量的值：

guessNum = scan.nextInt();

因此，您可能会获得一个不一致的循环次数，因为您正在更改循环所依赖的变量以进行控制。

鉴于此变量的名称，我怀疑您最初打算将其用于存储用户的输入。如果是这种情况，我会改变你的for循环以使用不同的变量，如下所示：

for (int guessCount = 0; guessCount < 10; guessCount++){

另请注意，您的病情最初为<= 10;因为你的计数变量从零开始，这将允许用户11猜测，而不是10（因为0到10包括= 11）。假设你想要10个猜测，你需要检查少于10个（因为0..10独占= 10）。

Answer 2

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

 public class NumberGuess {

    public static void main(String[] args) {

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

        System.out.println("Im thinking of a number from 1 to 10");
        int number = scan.nextInt(10);
         //Generates a random number from 1 to 10
        int number2 = rand.nextInt(10)+1;
        System.out.println("you enter the number" + " " + number);


        for (int counter = -1; counter < 3; counter ++ ){
             if(number!= number2)
               System.out.println("and your random number is:" + " " + number2 + " " + "please try again"); 
             else 
                 System.out.println("your guess number is equal to the random number Good job guessing");

             break;
         }

    }
  }

使用if语句和for循环Java的随机数猜测游戏

2 个答案: