Paint a Room

import java.util.Scanner;
public class Paint {

    public static void main(String[] args) {

        //declare and initialize Scanner object
        Scanner scan=new Scanner(System.in);

        //Constants are variables that use the final modifier.  They cannot be changed once they are initialized
        final int COVERAGE = 350;  //paint covers 350 sq ft/gal
        final int WINDOW_SQ_FT=10;
        final int DOOR_SQ_FT=20;
        //declare integers length, width, and height;
        int length=0, width=0, height=0;
        //declare intefers numWindows, numDoors
        int numWindows, numDoors;
        //declare integers totalWindowSqFt, totalDoorSqFt
        int totalWinSqFt, totalDoorSqFt;
        //declare double totalSqFt;
        int totalSqFt;
        //declare double paintNeeded;
        double paintNeeded;


        //inputs below!++++++++++++++++++++++++++++++++++++++++++++
        //Prompt for and read in the length of the room
        System.out.println("Please enter the length of the room.");
        length=scan.nextInt();

        //Prompt for and read in the width of the room
        System.out.println("Please enter the width of the room.");
        width=scan.nextInt();

        //Prompt for and read in the height of the room
        System.out.println("Please enter the height of the room.");
        height=scan.nextInt();

        //Prompt for and read in the number of windows
        System.out.println("Please enter the number of windows in the room.");
        numWindows=scan.nextInt();

        //Prompt for and read in the number of doors
        System.out.println("Please enter the number of doors in the room.");
        numDoors=scan.nextInt();

        //CALCULATIONS BELOW++++++++++++++++++++++++++++++++++++++++++
        //Compute the total square feet to be painted--think
        //about the dimensions of each wall minus the footage for windows and doors
        totalSqFt=(length*height*2)+(width*height*2);
        totalWinSqFt=numWindows*WINDOW_SQ_FT;
        totalDoorSqFt=numDoors*DOOR_SQ_FT;

        totalSqFt=totalSqFt-(totalWinSqFt+totalDoorSqFt);

        //Compute the amount of paint needed
        paintNeeded=(double)totalSqFt/COVERAGE;
        //Print the length, width, and height of the room and the
        //number of gallons of paint needed.
        System.out.println("Length: "+length+"\nWidth: "+width+"\nHeight: "+height);
        System.out.println("Total Surface Area: "+totalSqFt+"\nNumber of Doors: "+numDoors+"\nNumber of Windows: "+numWindows);
        System.out.println("Paint needed: "+paintNeeded+"\ngallons: ");

    }

}