Question

所以我是初学者使用java，我试图让用户输入华氏温度并将其转换为摄氏温度，同时确保使用输入双变量而不是字母的有效数字。而不是显示在用户身上。我特别遇到循环问题。这是我的代码。

import java.util.Scanner;

public class TempConverter
{
    public static void main(String[] args) 
    {  
        Scanner in = new Scanner(System.in);
        double temp;
        do
        {
            System.out.print("Please enter temperature in Fahrenheit: ");
            while(!in.hasNextDouble())
            {
                System.out.println("ERROR. Please enter a valid temperature: ");
                in.nextDouble();
            }  
            temp = in.nextDouble();
        }
        double finalTemp = ((temp - 32)*5)/9;
        System.out.print("Celsius value of Fahrenheit value " + temp + " is " + finalTemp + ".");
    }
}

Answer 1

一定要来了。它将继续迭代，直到满足while中的条件。

    do
    {
        System.out.print("Please enter temperature in Fahrenheit: ");
            System.out.println("ERROR. Please enter a valid temperature: ");
            in.nextDouble();
        temp = in.nextDouble();
    }
    while(!in.hasNextDouble())

我在做while while循环时遇到了麻烦

1 个答案: