當用戶輸入0時無法弄清楚如何退出do-while循環

Question

我只是在做一個簡單的猜謎游戲。 如果用戶輸入0，我需要執行do-while循環才能退出。按它的方式，如果這是他們輸入的第一個數字，則它會正確退出，否則，它會隨着猜測數的總和而遞增。 這是我的代碼：

System.out.println("The system will generate a random number between 1 and 100."
            + " Your goal is to guess this number.");
    do
    {

    Random secretNumberGen = new Random();
    int secretNumber = secretNumberGen.nextInt(100)+1;

    System.out.println("Enter a number between 1 and 100: ");
    guess = scan.nextInt();
    do
       {

        if(guess==secretNumber)
        {
            System.out.println("You guessed the number!");
        }
        else if(guess<secretNumber)
          {
         System.out.println("Your guess is too low! Guess again");
         numGuess++;
          }
        else if(guess>secretNumber)
          {
         System.out.println("Your guess is too high! Guess again");
         numGuess++;
          }
        else if(guess==0)
               break;
        System.out.println("Your number: \n");
        guess = scan.nextInt();
        guess++;
       }
    while(guess!=0&&guess!=secretNumber);

我猜測while（）循環中的條件可能不正確。 我從以前的那段時間（guess！= secretNumber）稍作更改。 。 也許現在更好，我們應該以其他方式輸入0？ 謝謝。

Answer 1

問題是您增加了除第一個猜測以外的所有猜測：

    System.out.println("Your number: \n");
    guess = scan.nextInt();
    guess++;

因此，他們需要輸入-1才能猜測為0並結束循環。 他們還需要輸入比secretNumber小一的secretNumber以進行正確的猜測。

Answer 2

為什么您需要在最后第二行使用guess ++？

刪除猜測++或將其注釋掉，您應該會沒事的

Answer 3

首先將您的guess == 0條件。 由於0小於任何生成的數字，它將首先進入該條件。

Answer 4

如果這是他們輸入的第一個數字，它會正確退出，否則它將作為猜測總數的總和而增加

此行導致這一點，據我了解，不需要您的代碼：

guess++;

Answer 5

這是您應該做的：

System.out.println("The system will generate a random number between 1 and 100."
        + " Your goal is to guess this number.");
do
{

Random secretNumberGen = new Random();
int secretNumber = secretNumberGen.nextInt(100)+1;

System.out.println("Enter a number between 1 and 100: ");
guess = scan.nextInt();
do
   {
    // Exit condition is being checked first so that control does not enter
    // the less-than-secret-number-condition which would always be true for zero
    if(guess==0)
         break;

    // If its not zero, num of guesses is to be incremented
    numGuess++;

    if(guess==secretNumber)
    {
        System.out.println("You guessed the number!");
        break; // Exits if it is zero or the secret number
    }
    else if(guess<secretNumber)
      {
     System.out.println("Your guess is too low! Guess again");
     // Commenting out the increment as its already done
     // numGuess++;
      }
    else if(guess>secretNumber)
      {
     System.out.println("Your guess is too high! Guess again");
     // Commenting out the increment as its already done
     // numGuess++;
      }

    System.out.println("Your number: \n");
    guess = scan.nextInt();
    // guess++ has been removed as I think it serves no purpose. numGuess is the variable maintaining the count

   }
while(true); // Changed the condition here as the exit conditions have already bee dealt with within the loop