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تكملة سؤال الاخت مستجدة.. طبعا هذا مجود شخصي وقد اصيب او اخطا.. بالتوفيق للجميع
تنبيه الرجاء الانتباه ومراجعة الكود كامل ومحاولة التغيير حتى لاتكون الاجابات متشابهه

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/

package javaapplication2;
import java.util.Scanner;

/
*
* @author ahmed ali
*/
public class JavaApplication2 {

/
* @param args the command line arguments
*/
public static void main(String[] args) {
final int COVERAGE = 350; //paint covers 350 sq ft/gal
int length, width,height; //declare integers length, width, and height;
double totalSqFt; //declare double totalSqFt;
double paintNeeded; //declare double paintNeeded;
int doors,windows; //number of doors and windows
double room_withNo_windows,room_withNo_doors,final_total; //total without doors and windows
Scanner sc = new Scanner(System.in);

System.out.println( "Please enter the length of the room: " );
length = sc.nextInt();

System.out.println( "Please enter the width of the room: " );
width = sc.nextInt();

System.out.println( "Please enter the height of the room: " );
height = sc.nextInt();

totalSqFt=(2*length*height)+ (2*width*height);//Compute the total square feet to be painted

paintNeeded= totalSqFt / COVERAGE;//Compute the amount of paint needed

System.out.printf("\nThe length of the room is %d",length);
System.out.printf("\nnThe width of the room is %d",width);
System.out.printf("\nThe height of the room is %d",height);

System.out.printf("\nThe number of gallons of paint needed is %f",paintNeeded," gallons. \n");
System.out.printf(" so you have to purchase %.0f",Math.ceil(paintNeeded)," gallons. \n");


System.out.println( "\nPlease enter the number of doors in the room: " );
doors = sc.nextInt();
room_withNo_doors = doors *20;
System.out.println( "Please enter the number of windows in the room: " );
windows= sc.nextInt();
room_withNo_windows = windows * 15;

final_total = room_withNo_doors+room_withNo_windows;
final_total= final_total/COVERAGE;
paintNeeded = paintNeeded - final_total;
System.out.printf("\nThe number of gallons of paint needed is %.0f",Math.ceil(paintNeeded)," gallons. \n");

}
}