温度不正确的用户输入 [英] Temperature incorrect user input

问题描述

重复温度编程项目，添加一个允许
的循环，用户可以继续输入温度，直到它们进入Q或
q以退出程序的该部分。用户应输入一个Q或q
退出，一个空字符串继续。 （任何其他条目应导致
重复该问题）如果用户输入不同的字母
表示温度为F或C（大写或小写）），请打印
错误消息并要求用户输入正确的温度标度
，而不需要新的数值。

Repeat the temperature programming project adding a loop that allows the user to continue entering in temperatures, until they enter a Q or q to exit that portion of the program. The user should enter a Q or q to exit and an empty String to continue. (Any other entry should cause the question to be repeated) If the user enters a different letter that F or C(either upper or lower case) for the temperature, print an error message and ask the user to enter the correct temperature scale without asking for a new numeric value.

这是我有到目前为止....我无法得知它是否进入65D而不是65C。我不知道如果他们输入D而不是F / f或C / c ...如何循环通过代码。

This is what I have so far....I cannot get it to read whether or not they entered 65D instead of 65C. And I can't figure out how to loop it back through the code if they enter D instead of F/f or C/c...

import java.util.Scanner;
public class AssignmentFour {
public static Scanner keyboard = new Scanner(System.in);
public static void main(String[] args) {
    // TODO Auto-generated method stub

    System.out.println("Hello, I can convert Fahrenheit to Celsius!");
    System.out.println("Please enter the temperature you want converted.");
    System.out.println("Followed by: 'C/c' or 'F/f'");

    String input2 = keyboard.next();

    do{
        String temp = input2.trim();
        String degreesAsString = temp.substring(0, temp.length()-1);
        double degrees = Double.parseDouble(degreesAsString);

        if(temp.endsWith("C") || temp.endsWith("c")){            
            double degreeF = 9 * degrees / 5 + 32;
            System.out.println(input2 + " is equal to: ");
            System.out.printf("%.2f", degreeF);
            System.out.println(" Fahrenheit.");

        } else if(temp.endsWith("F") || temp.endsWith("f")){
            double degreeC = 5 * (degrees - 32) / 9;
            System.out.println(input2 +" is equal to: ");
            System.out.printf("%.2f", degreeC);
            System.out.println(" Celsius.");

        } else if (temp.endsWith(""));{
            System.out.println("ERROR: Please enter either 'F/f or C/c'.");     
        }
        break;
    } while(!input2.equals(""));

    System.out.println("");
}

推荐答案

只需移动你的 ... = keyboard.next（）在你的循环中读取新的用户输入。另外，你应该删除 break ; 语句，目前正在阻止执行任何循环。

just move your ... = keyboard.next() inside your do-while loop to read new user inputs when you're looping.. Also, you should remove the break; statement that is currently just preventing from any loop to be done.

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