循环错误

Question

你好，我是一名初学Java程序员。当我输入正确的数字（没有打印消息）时，我的程序会一直结束，或者它不会从较低的数字变为较高的数字而不会结束？ 有人能告诉我我做错了吗？

package week3;
import java.util.Scanner;


public class Week3 {

    public static void main(String[] args) {

    Scanner In = new Scanner(System.in);   

    int Guess ;
    int count = 0;
    count++;
    int c = 55;

    System.out.println("Welcome to the Higher / Lower game! Try to guess the" 
    + "number between 1 and 100. ");


    System.out.print("Enter your guess: ");
    Guess = In.nextInt();


    if(Guess == c)
    {

        System.out.println("The number was 55 you guessed correctly! "                    
        + " it took you " + count +" tries");            
     }//end if

   while (Guess < 1)
    {
        System.out.println("Sorry, the guess needs to be a number between 1 and"
        + " 100. Please try again:");
        Guess = In.nextInt();

    }//End while < 1

   while (Guess > 100)
    {
        System.out.println("Sorry, the guess needs to be a number between 1 and"
        + " 100. Please try again:");
        Guess = In.nextInt();

    }//end while <100

    while (Guess >= 56)
    {
        System.out.println("The number is lower.");
        Guess = In.nextInt();
    }   //end while over 55  

   while (Guess <= 54)
    {
        System.out.println("The number is higher.");
        Guess = In.nextInt();
    }//end while lower than 55


 }//end main

}//end class

Answer 1

我可以看到问题所在，但您最好自己尝试找到它。 （或者另外去......）

提示：

1. 尝试手动执行代码。假装你是电脑，并用铅笔和纸来模拟它会做什么。

2. 您是否尝试过使用调试器？

3. 有些评论也是很好的提示。

---

虽然我有你的耳朵，你也应该注意你的编程风格。 Java的一个通用样式规则是变量应该以小写字母开头。您的In和Guess变量违反了这一点。

Answer 2

System.out.println("Welcome to the Higher / Lower game! Try to guess the" 
+ "number between 1 and 100. ");

while (true) {
System.out.print("Enter your guess: ");
Guess = Integer.parseint(In.nextLine());

if(Guess == c)
{

    System.out.println("The number was 55 you guessed correctly! "                    
    + " it took you " + count +" tries");
    break;    
 }


if (Guess < 1)
{
    System.out.println("Sorry, the guess needs to be a number between 1 and"
    + " 100. Please try again:");

}


  if (Guess > 100)
{
    System.out.println("Sorry, the guess needs to be a number between 1 and"
    + " 100. Please try again:");


}

if (Guess >= 56)
{
    System.out.println("The number is lower.");

} 


if (Guess <= 54)
{
    System.out.println("The number is higher.");

}
}





}

}

希望这能让您了解使用while循环的想法。

Answer 3

您的程序结构不正确。

循环时只需要一个。使用while循环开始您的程序，并继续条件，例如：

    boolean numFound = false; 
    while (!numFound) { 

        //conditions
    }