Question

我有这个Java代码。这是一个简单的小东西，我试图通过除去占用房间的总数，但房间的总数来获得酒店的入住率。但是，当我尝试编译代码时，我得到了：

C:\Users\Jerome\Documents\Computer Concepts and Programming\Lab04\JRGlab04Num07\JRGlab04Num07.java:62: error: variable totalORooms might not have been initialized
            totalORooms += numORooms;
            ^
C:\Users\Jerome\Documents\Computer Concepts and Programming\Lab04\JRGlab04Num07\JRGlab04Num07.java:63: error: variable totalRooms might not have been initialized
            totalRooms += numRooms;
            ^
C:\Users\Jerome\Documents\Computer Concepts and Programming\Lab04\JRGlab04Num07\JRGlab04Num07.java:68: error: variable totalORooms might not have been initialized
        ORate = totalORooms / totalRooms;
                ^
C:\Users\Jerome\Documents\Computer Concepts and Programming\Lab04\JRGlab04Num07\JRGlab04Num07.java:68: error: variable totalRooms might not have been initialized
        ORate = totalORooms / totalRooms;
                              ^
4 errors

Tool completed with exit code 1

那么为什么它会忘记我已经说过的变量。

import java.util.Scanner; //Needed for Inputting
import java.text.DecimalFormat;//Needed for Rounding

/**
The pourpose of this lab is:
To calculate the occupancy rate of a hotel
by JEROME GERO Lab 04 Number 07
*/

public class JRGlab04Num07
{//Begin Class
    public static void main(String[] args)
    {//Begin Main Method

        //Variables and introduction
        double totalFloors, floor, numRooms, numORooms;
        double totalRooms;
        double totalORooms;
        double ORate;
        System.out.println("Welcome to the Hotel Occupancy Calculator.\nPlease enter the number of floors we will be dealing with:");
        Scanner keyboard = new Scanner(System.in);
        DecimalFormat formatter = new DecimalFormat("#0.00");


        totalFloors = keyboard.nextInt();
        floor = 0;

        while(totalFloors < 1)
        {
            System.out.println("No, lets try that again.");
            totalFloors = keyboard.nextInt();
        }

        System.out.println("Okay");


        while(totalFloors > 0)
        {

            ++floor;
            System.out.println("Now enter the number of rooms on floor " + floor);
            numRooms = keyboard.nextDouble();


            while(numRooms < 10){
                System.out.println("The Number of rooms nust be greater than 10.\nPlease enter the number of rooms.");
                numRooms = keyboard.nextDouble();
            }


            System.out.println("Now enter the number of occupied rooms on that floor:");
            numORooms = keyboard.nextDouble();


            while(numORooms > numRooms){
                System.out.println("No, the Number of Occupied rooms can not be more than the number of rooms on this floor.\n" +
                "Please enter that again.");
                numORooms = keyboard.nextDouble();
            }


            totalORooms += numORooms;
            totalRooms += numRooms;
            --totalFloors;

        }

        ORate = totalORooms / totalRooms;

        System.out.println(ORate);

    }//End Main Method
}//End Class

Answer 1

您没有为totalRooms分配值。该错误告诉您它尚未初始化。

double totalRooms = 0.0;

在Java变量被陈述，但后来被遗忘？

1 个答案: