按“y”或“Y”

Question

import java.util.Scanner;
 class Quiz4 {
    public static void main(String args[]){
		char repeat = userInput.charAt(0);
		do{

       Scanner input = new Scanner( System.in );
       System.out.println("Enter a binary number ");
       String binaryString =input.nextLine();

       if (binaryString.matches("[10]+")) {
		   System.out.println ("You entered " +binaryString );
          System.out.println("Its base of 10 equivalent is "+Integer.parseInt(binaryString,2));
       } else {
          System.out.println ("Try again ");
          }while (repeat == 'Y' || repeat == 'y');
       }
    }
}

我正在编写一个将二进制转换为十进制的代码，除了我必须确保程序继续工作直到用户提示它停止之外，我已经完成了所有工作。我不知道如何将它应用于我的代码。我知道我使用了do / while循环，但我不知道如何应用它。

 import java.util.Scanner;
 class Quiz4 {
    public static void main(String args[]){
       Scanner input = new Scanner( System.in );
       System.out.println("Enter a binary number ");
       String binaryString =input.nextLine();
       if (binaryString.matches("[10]+")) {
           System.out.println ("You entered " +binaryString );
          System.out.println("Its base of 10 equivalent is "+Integer.parseInt(binaryString,2));
       } else {
          System.out.println ("Try again ");
       }
    }
}

Answer 1

您的代码中存在2个问题。 1）重复不会在循环中改变，因此循环将永远循环或仅运行一次。要解决此问题，在循环中的某个时刻，您需要将repeat更改为用户在被问及是否要继续进行时的最后响应。这让我想到2）你永远不会问用户他们是否想再次转换。询问用户是否要继续使用，指定他们必须回答Y或y，然后将他们的回复存储在重复

Answer 2

使用do while循环

import java.util.Scanner;
 class Main {
    public static void main(String args[]){
       Scanner input = new Scanner( System.in );
       String str;
       do{
           System.out.println("Enter a binary number ");
           String binaryString =input.nextLine();
           if (binaryString.matches("[10]+")) {
               System.out.println ("You entered " +binaryString );
              System.out.println("Its base of 10 equivalent is "+Integer.parseInt(binaryString,2));
           } else {
              System.out.println ("Try again ");
           }
           System.out.println("Do you want to continue ? Press Y or y");
           str = input.nextLine();
       }while(str.charAt(0) == 'Y'||str.charAt(0) == 'y');

       System.out.println("Exiting");
    }
}

在控制台上输出。

Enter a binary number 
100
You entered 100
Its base of 10 equivalent is 4
Do you want to continue ? Press Y or y
y
Enter a binary number 
102
Try again 
Do you want to continue ? Press Y or y
y
Enter a binary number 
111
You entered 111
Its base of 10 equivalent is 7
Do you want to continue ? Press Y or y
Y
Enter a binary number 
110
You entered 110
Its base of 10 equivalent is 6
Do you want to continue ? Press Y or y
n
Exiting