当用户输入0时无法弄清楚如何退出do-while循环

Question

我只是在做一个简单的猜谜游戏。 如果用户输入0，我需要执行do-while循环才能退出。按它的方式，如果这是他们输入的第一个数字，则它会正确退出，否则，它会随着猜测数的总和而递增。 这是我的代码：

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);

我猜测while（）循环中的条件可能不正确。 我从以前的那段时间（guess！= secretNumber）稍作更改。 。 也许现在更好，我们应该以其他方式输入0？ 谢谢。

Answer 1

问题是您增加了除第一个猜测以外的所有猜测：

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

因此，他们需要输入-1才能猜测为0并结束循环。 他们还需要输入比secretNumber小一的secretNumber以进行正确的猜测。

Answer 2

为什么您需要在最后第二行使用guess ++？

删除猜测++或将其注释掉，您应该会没事的

Answer 3

首先将您的guess == 0条件。 由于0小于任何生成的数字，它将首先进入该条件。

Answer 4

如果这是他们输入的第一个数字，它会正确退出，否则它将作为猜测总数的总和而增加

此行导致这一点，据我了解，不需要您的代码：

guess++;

Answer 5

这是您应该做的：

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