當計數器不能正常工作

Question

林新到Java並想提出一個猜謎遊戲在用戶有猜測0和50

之間的隨機整數我試圖猜測添加計數器在「遊戲結束」之前給用戶高達7的遊戲猜測然而，即使我的while循環，櫃檯仍然保持在7以上。

我提前道歉，如果這是一個重複的問題，但是我也有一個簡單的介紹一下，但沒有找到一個很好的答案對我的代碼

繼承人的代碼：

package guessinggame; 
import java.util.Random; 
import java.util.Scanner; 
public class GuessingGame { 
//Author TC13551 


public static void main(String[] args) { 
    int NumberGuess = 0; 
    Random randomNumber = new Random(); 
    int randomInt = randomNumber.nextInt(51); 
    System.out.println("Guess the number between 0 -50:"); 
    int i = 0; 
    while(i < 8){ 
    do{ 

     Scanner UserGuess = new Scanner(System.in); 
     NumberGuess = UserGuess.nextInt(); 
     if(NumberGuess < 0 || NumberGuess > 50){ 
      System.out.println("Invalid Input, please enter numbers between 0 and 50"); 
     } 
     else if(NumberGuess < randomInt){ 
      System.out.println("Guess is too small."); 
      i ++; 
      System.out. println("You have made "+i +" guesses out of 7"); 
     } 

     else if(NumberGuess > randomInt) { 
      System.out.println("Guess is too big."); 
      i ++; 
      System.out. println("You have made "+i +" guesses out of 7"); 

     } 
      else if(NumberGuess == randomInt){ 
      System.out.println("Correct! You win!"); 
      System.out.println("It took you "+ i + " guesses."); 
      System.exit(0); 
     } 


    }while(randomInt != NumberGuess); 


}System.out.println("Game over!"); 
System.out.println("All 7 Guesses used!"); 
System.exit(0); 

    }} 

Answer 1

你應該有一個循環，如果你想在7個猜測終止：

do { 
    .... 
} while(randomInt != NumberGuess) && (i < 8); 

當你只能在外環測試i，你給用戶無限numbe猜測，因爲一旦用戶猜到了正確的數字，你就只剩下內部循環了。只有在你離開內部循環之後，你才能測試猜測的次數。

Answer 2

您還可以檢查存在的條件下，如果不能是不是猜測和i值由下式給出機會超過（例如：7在你的情況下）：

}while(i < 8); 

注：去除不必要的情況看@Rehman評論。
如果用戶猜到正確的號碼，您可以刪除randomInt != NumberGuess，因爲您有System.exit(0)。

Answer 3

我認爲它可能解決您的查詢，

import java.util.Random; 
import java.util.Scanner; 
public class GuessingGame { 
    //Author TC13551 


    public static void main(String[] args) { 
     int NumberGuess = 0; 
     Random randomNumber = new Random(); 
     int randomInt = randomNumber.nextInt(51); 
     System.out.println("Guess the number between 0 -50:"); 
     int i = 0; 
      do{ 

       Scanner UserGuess = new Scanner(System.in); 
       NumberGuess = UserGuess.nextInt(); 
       if(NumberGuess < 0 || NumberGuess > 50){ 
        System.out.println("Invalid Input, please enter numbers between 0 and 50"); 
       } 
       else if(NumberGuess < randomInt){ 
        System.out.println("Guess is too small."); 
        i ++; 
        System.out. println("You have made "+i +" guesses out of 7"); 
       } 

       else if(NumberGuess > randomInt) { 
        System.out.println("Guess is too big."); 
        i ++; 
        System.out. println("You have made "+i +" guesses out of 7"); 

       } 
       else if(NumberGuess == randomInt){ 
        System.out.println("Correct! You win!"); 
        System.out.println("It took you "+ i + " guesses."); 
        System.exit(0); 
       } 


      }while(i < 8); 

      System.out.println("Game over!"); 
     System.out.println("All 7 Guesses used!"); 
     System.exit(0); 

    }} 

Answer 4

public class GuessingGame { 
    public static void main(String[] args) { 
     int NumberGuess = 0; 
     Random randomNumber = new Random(); 
     int randomInt = randomNumber.nextInt(51); 
     System.out.println("Guess the number between 0 -50:"); 
     int i = 1; 
     Scanner UserGuess = new Scanner(System.in); 

     while (i <= 7) { 

      NumberGuess = UserGuess.nextInt(); 
      if (NumberGuess == randomInt) { 
       System.out.println("Correct! You win!"); 
       System.out.println("It took you " + i + " guesses."); 
       System.exit(0); 
      } else if (NumberGuess < 0 || NumberGuess > 50) { 
       System.out.println("Invalid Input, please enter numbers between 0 and 50"); 
      } else if (NumberGuess < randomInt) { 
       System.out.println("Guess is too small."); 
      } else if (NumberGuess > randomInt) { 
       System.out.println("Guess is too big."); 
      } 
      System.out.println("You have made " + i + " guesses out of 7"); 
      i++; 
     } 

     System.out.println("Game over!"); 
     System.out.println("All 7 Guesses used!"); 
     System.exit(0); 
    } 
} 

而且你不應該Scanner UserGuess = new Scanner(System.in);使用內循環這一說法。 只能在循環外部創建一個掃描儀副本。