如何在 while 循环中修复此计数器？答案

【问题标题】：How do i fix this counter in a while loop?如何在 while 循环中修复此计数器？
【发布时间】：2014-03-22 17:17:31
【问题描述】：

  //Name: Justin 

  import java.util.Scanner;

  public class hotelOccupancy
  {

  public static void main(String[] args)
  {

  Scanner keyboard = new Scanner(System.in);
  int floors, roomNo, occRooms, emptyRooms, occRoomsT = 0, roomNoT = 0;
  double occupancyRate;

  System.out.print("Enter the amount of floors in the hotel(must enter at least 1): ");
    floors = keyboard.nextInt();

  while(floors > 0)
     {
  System.out.print("Enter the amount of rooms on floor " + floors + ":");
    roomNo = keyboard.nextInt();

     if(roomNo < 10)
     {
  System.out.println("There is a minimum of 10 rooms per floor");
  System.out.print("Enter the amount of rooms on floor " + floors + ":");
    roomNo = keyboard.nextInt();
     }

  System.out.print("Enter the amount of rooms on floor " + floors + " that are occupied: ");
    occRooms = keyboard.nextInt();

     if(occRooms < 0 || occRooms > roomNo)
     {
  System.out.println("Please enter a valid number of occupied rooms");
  System.out.print("Enter the amount of rooms on floor " + floors + " that are occupied: ");
    occRooms = keyboard.nextInt();
     }

   occRoomsT = occRoomsT + occRooms;
   roomNoT = roomNoT + roomNo;  
   floors--;
   }

  occupancyRate = occRoomsT / roomNoT;
  emptyRooms = roomNoT - occRoomsT;

  System.out.println("The total amount of rooms is: " + roomNoT);
  System.out.println("The total amount of occupied rooms is: " + occRoomsT);
  System.out.println("The occupancy rate is: " + occupancyRate);
  System.out.println("The amount of vacant rooms is: " + emptyRooms);

  }
  }

你好，这个程序是用来计算酒店的入住率、房间总数、占用房间总数和空置房间总数的。输入是楼层的数量、每层的房间数量以及给定楼层的占用房间数量。输入输入数据后，入住率始终为 0.0，这是我的问题。我感觉问题出在我的变量计数器上：occRoomsT 和 roomNoT。

【问题讨论】：

你在做整数运算而不是浮点运算。在执行除法之前将变量转换为float 或double。
顺便说一句，如果您写过sscce.org，您可能已经自己发现了问题（与循环完全无关）。
@SJuan76 我将 emptyRooms、roomNoT 和 occRoomsT 变量更改为双精度，现在程序可以完美运行。谢谢！

标签： java while-loop counter

【解决方案1】：

随便做，

occupancyRate = ((double)occRoomsT) / roomNoT;

房间的总数总是一个整数，将它们声明为双精度不是一个好习惯，与整数相比，这会占用更多空间。

【讨论】：