Question

IN JAVA

Write a program that calculates the occupancy rate for each floor of a hotel. (Use a sentinel value and please point out the sentinel in bold.) The program should start by asking for the number of floors in the hotel. A loop should then iterate once for each floor. During each iteration, the loop should ask the user for the number of rooms on the floor and the number of them that are occupied. After all the iterations, the program should display the number of rooms the hotel has, the number of them that are occupied, the number that are vacant, and the occupancy rate for the hotel. Input Validation: Do not accept a value less than 1 for the number of floors. Do not accept a number less than 10 for the number of rooms on a floor.

Answer 1

I have uploaded the Images of the code, Typed code and Output of the Code. I have provided explanation using comments (read them for better understanding).

Images of the Code:
Note: If the below code is missing indentation please refer code Images

Typed Code:

// importing required packages
import java.util.*;

// Main class
public class Main
{
   public static void main(String[] args)
   {
   // Creating a Scanner Object
   Scanner input = new Scanner(System.in);
  
   // A variable to store number of floors
   int floors = 0;
  
   // Prompting to enter number of floors
   System.out.print("Enter Number of floors in the Hotel :");
   // reading input from user
   floors = input.nextInt();
   // Input Validation
   // A while loop to ask user to enter valid input
   while(floors<1)
   {
   // printing error message
   System.out.println("Invalid Input: Number of floors must be 1 or more");
   // Prompting to enter number of floors
   System.out.print("Enter Number of floors in the Hotel :");
   // reading input from user
   floors = input.nextInt();
   }
  
   // An array to store number of rooms in each floor
   int rooms[] = new int[floors];
   // An array to store number of Occupied rooms in each floor
   int occupied_rooms[] = new int[floors];
   // An array to store number of Vacant rooms in each floor
   int vacant_rooms[] = new int[floors];
  
   // A for loop to ask user number of rooms in each floor
   for (int i=0; i < floors ;i++ )
   {
   // Prompting to enter number of rooms
   System.out.print("\nEnter number of rooms in the floor " +(i+1)+": ");
   // reading user input
   rooms[i] = input.nextInt();
   // Input Validation
   // A while loop to ask user to enter valid input
   while(rooms[i]<10)
   {
   // printing error message
   System.out.println("Invalid Input: Each floor must consist of at least 10 rooms");
   // Prompting to enter number of rooms
   System.out.print("Enter number of rooms in the floor " + (i+1) +": ");
   // reading user input
   rooms[i] = input.nextInt();
   }
  
   // Prompting to enter rooms occupied
   System.out.print("Enter number of rooms occupied on the floor "+ (i+1) +": ");
   // reading input from user
   occupied_rooms[i] = input.nextInt();
  
   // Input Validation
   // A while loop to ask user to enter valid input
   while(occupied_rooms[i] > rooms[i])
   {
   // printing error message
   System.out.println("Invalid Input: Occupied rooms must be less the total floor rooms");
   // Prompting to enter rooms occupied
   System.out.print("Enter number of rooms occupied on the floor "+(i+1)+": ");
   // reading input from user
   occupied_rooms[i] = input.nextInt();
   }
  
   // Calculating vacant rooms
   vacant_rooms[i] = rooms[i] - occupied_rooms[i];
   }
  
   // variables to store total_rooms ,occupied_rooms and vacant_rooms
   int total_rooms = 0, total_occupied_rooms = 0, total_vacant_rooms = 0;
   // Calculating the total_rooms, occupied_rooms and vacant_rooms
   for(int i=0;i< floors;i++)
   {
   // Calculating total_rooms
   total_rooms = total_rooms + rooms[i];
   // Calculating total_occupied_rooms
   total_occupied_rooms = total_occupied_rooms + occupied_rooms[i];
   // Calculating total_vacant_rooms
   total_vacant_rooms = total_vacant_rooms + vacant_rooms[i];
   }
  
   // printing total rooms
   System.out.println("\nThe Total Number of rooms in the Hotel: " + total_rooms);
   // printing occupied rooms
   System.out.println("Number of Occupied Rooms: " + total_occupied_rooms);
   // printing vacant rooms
   System.out.println("Number of Vacant Rooms: " + total_vacant_rooms);
   //printing occupancy rate
   double Occupancy_rate = (total_occupied_rooms*100.0/total_rooms);
  
   System.out.println("The Occupancy rate of the Hotel is " + Occupancy_rate + "%");
  
   }
}
//code ended here

Output:

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