尝试使用while循环执行6次循环

Question

我正在尝试让我的程序循环6次。我的问题是，它一直在运行，并且在6次之后没有停止。我将answer、userGuess和numOfGuesses作为实例变量。

public static int guess(int userGuess){ 

System.out.println("Enter your guess");    
  
  while (numOfGuesses <= 6){  // this is my problem     
    numOfGuesses = numOfGuesses + 1 ;
    
  while (userGuess != answer){
       userGuess = scan.nextInt();    
                            
  if(userGuess < answer){                 
       System.out.println("Too low, try again");
    }
            
  else if(userGuess > answer){  
       System.out.println("Too high, try again");
    }                  
                       
  else{                   
   }                   
  } 
 }
// rest of method works fine 

Answer 1

我想通了。我会在我的项目评分后发布整个答案，但它需要一个for循环。

另外，我希望这对将来在猜谜游戏项目中遇到困难的学生有所帮助。显然，不要复制和粘贴，但要以此为起点。这是教授们看你是否抄袭代码的第一个地方。

private static int setGuess(int userGuess){  
  int differential = answer - guess;
  String low = "Too low, try again ";
  String high = "Too high, try again ";
  String colder = "Getting colder";
  String warmer = "Getting warmer";
 
       
  System.out.println("Enter your guess.");
       
  for(int i = 0; i < 6; i++){
                         
     while(userGuess != answer){
        userGuess = scan.nextInt();
        
        if (userGuess < answer){
           System.out.println(low);
           
           if(differential < 15){
              System.out.println(colder);
           }
           else if (differential >= 15){
              System.out.println(warmer);
           } 
           
           else{
           }          
        }  
        
        else if (userGuess > answer){
           System.out.println(high);
            
           if(differential <= 15){
              System.out.println(warmer);
           }
           
           else if (differential > 15){
              System.out.println(colder);
           } 
           
           else{
           }  
        }
        
        else{
        }
     }
  }
     
     if (userGuess == answer){
        System.out.println("Congratulations! You guessed the number!");
     } 
            
     if (numOfGuesses == MAX_GUESSES_ALLOWED){
      gameOver = true;
   
  }
    
   return userGuess;
  }

Answer 2

这种循环结构可能不是您想要的。在有2个while循环的情况下，您实际上并没有以任何方式限制猜测的数量-您所要做的就是重新运行猜测程序6次。此外，由于内部while循环会一直执行，直到答案完全正确，所以用户无法知道他们的猜测是过低还是过高。你可能想要类似这样的东西：

public static int guess(int userGuess){ 
    do {
        System.out.println("Enter your guess: ");   
        userGuess = scan.nextInt();
        if (userGuess < answer) {                 
           System.out.println("Too low, try again");
        } else if (userGuess > answer) {  
            System.out.println("Too high, try again");
        } else {                   
            // todo tell the user they were right
        }
        numOfGuesses = numOfGuesses + 1;
    } while (numOfGuesses <= 6 && userGuess != answer);
    // in the case the user used up all their guesses, tell them they didn't get it right
    // todo return something here because this function is supposed to return an int
}

还要注意我在底部的注释，这个方法在返回一些东西之前不会编译。我还假设所有引用的变量都在其他地方定义。

我也怀疑参数是userGuess --提供一个我们立即覆盖的参数有什么意义呢？也许参数应该是answer？

Answer 3

程序中的一个主要问题是while语句中的条件不会给出您想要的结果。您应该使用带有while(numOfGuesses<=6 && userGuess != answer)条件的while循环代替两个while循环。这是因为while循环将一直执行，直到它运行六次，并且用户到那时还没有猜到答案。假设您的实例变量和方法使用了一个类，而另一个类包含了main方法，那么您可以尝试这样做。

public class guess {

 //these are your instance variables 
 int numOfGuesses=6;
 int tempNum =1;
 
 //answer can be any number. I use 2 as an example, this is the number to be guessed in 6 tries. 
 int answer = 2;
 

public void guess(int userGuess, int answer){ 
      if(userGuess < answer){                 
           System.out.println("Too low of a number");
        }
                
      else if(userGuess>answer){  
           System.out.println("Too high of a number");
        }
      //do something when user guesses answer. Example, end the program.
      else if(userGuess==answer) {
          //print the correct guess
          System.out.println("You have guessed the correct answer " + answer);
          
          //exit out of entire program
          System.exit(0);
  }
 }
}

上面的类包含实例变量，但没有main方法和guess方法。因此，使用main方法创建另一个类。这使用了面向对象的编程。

import java.util.Scanner;

public class guessTester { 
public static void main(String[] args) {
   //initialize userGuess
   int userGuess = 0;
   
   //input for scanner
   Scanner input = new Scanner(System.in);
   
   
   guess Guess = new guess();
    
    //while loop becomes false when numOfGuesses = 6 and the userGuess does not equal to the answer. 
      while (Guess.tempNum<= Guess.numOfGuesses && userGuess != Guess.answer){  
        System.out.println("Enter a guess");
        userGuess = input.nextInt();
           
        Guess.tempNum+=1;

        Guess.guess(userGuess,Guess.answer);
         
        //if the temporary number is equal to number of guesses
        if(Guess.tempNum -1 ==Guess.numOfGuesses) {
            System.out.println("You ran out of guesses ! ");
        }
      }  
  }
}