/* Painting Project (15 points) 

Write a complete C program that can help you calculate how much 
paint you need in order to paint a room. The program must do the following:

 * Ask the user to enter 
       - the length (L), width (W), and height (H) of the room. 
       - the number of doors that the room has.
       - the width and height of the door(s).
 * Print the area of the paintable surface (all 4 walls plus the
         ceiling minus the doors).
 * Print the gallons of paint required to paint the room
 * Print the number of 5 gallon buckets of paint that you must purchase
 
Assumptions: * the room has no windows; just doors of equal size.
             * 1 gallon of paint can cover 20 square feet of wall area  
 
*/


#include <stdio.h>
#include <stdlib.h>
#include <math.h>
	
#define SQFT_PER_GALLON 20

int main()
{
	float L, W, H;
	float dw, dh;
	int nDoors;
	
	printf("Enter room Length (in ft): ");
	scanf("%f", &L);

	printf("Enter room Width (in ft):  ");
	scanf("%f", &W);

	printf("Enter room Height (in ft): ");
	scanf("%f", &H);

	printf("Enter number of doors: ");
	scanf("%d", &nDoors);

	printf("Enter door width (in ft):  ");
	scanf("%d", &dw);

	printf("Enter door height (in ft): ");
	scanf("%d", &dh);

	float doorArea = dw*dh;
	
	float ceiling_area = W*L;
	float wall_area = 2*W*H + 2*L*H;
	
	float paintable_area = wall_area + ceiling_area - doorArea*nDoors;
	
	printf("The paintable surface area is %g (ft^2)\n\n", paintable_area);
	
	float gallons = paintable_area / SQFT_PER_GALLON;
	int nBuckets = ceil(gallons/5.0);
	
	printf("This would require %g gallons to paint.\n", gallons);
	printf("You must purchase %d buckets of paint (5 gallons each).\n\n", nBuckets);

	system("pause");
}