Question

please explain in C++ only

This program determines how much it cost to paint a room Please write a program which determines and prints out three results. 1. The number of exact gallons of paint to paint the walls and the ceiling (NOT THE FLOOR) of the room if 1 gallon is enough to paint 400 square feet. 2. How many gallons of paint you need to buy since you cannot buy part of a gallon. So if you need 3.2 gallons you must buy 4 gallons. 3. The cost of the paint based on the following cost of paint: One gallon of paint cost 30 dollars but you get a 10% discount if you buy 3 or more gallons of paint and a 20% discount if you buy 5 or more gallons of paint. Please test your program with all three sets of the following data: Example Executions: Execution 1: Please enter the width of the room in feet: 8 Please enter the length of the room in feet: 8 Please enter the height of the room in feet: 10.5 You need exactly 1 gallon(s) of paint so you need to buy 1 gallon(s) which cost $30 dollars

Answer 1

Source Code::

#include <bits/stdc++.h>    //header file for ceil
using namespace std;

int main() {
   // your code goes here
   double length,width,height;
   //taking inputs from user
   cout<<"Please enter the width of the room in feet: ";
   cin>>width;
   cout<<"Please enter the length of the room in feet: ";
   cin>>length;
   cout<<"Please enter the height of the room in feet: ";
   cin>>height;
   //total_area for find total wall_area+ceil_area
   //wall_area will compute 2 wall(length,height) and 2 wall(width,length)
   //ceil_area will compute ceiling area(length,width)
   double total_area,wall_area,ceil_area;
   wall_area= 2*length*height+2*height*width;
   ceil_area=width*length;
   total_area=wall_area+ceil_area;
  
   //total_gallon is equals to total_area per 400 sq. feet
   double total_gallon=total_area/400.0;
   //total_cost is equals to ceil(total_gallon)*30 and we will subtract discount later
   double total_cost=ceil(total_gallon)*30;
  
   //subtracting discount
   // if total gallons are greater than 5 then 20% discount
   if(ceil(total_gallon)>=5){
        total_cost-=0.2*total_cost;
   }
   else if(ceil(total_gallon)>=3) // if total gallons are greater than 3 then 10% discount
   {
        total_cost-=0.1*total_cost;
   }
   cout<<"You need exactly "<<total_gallon<<" gallon(s) of paint so you need to buy "<<ceil(total_gallon)<<" gallon(s) which cost $"<<total_cost<<" dollers.";
   return 0;
}

Output::

Please enter the width of the room in feet: 8 Please enter the length of the room in feet: 8 Please enter the height of the room in feet: 10.5 You need exactly 1 gallon(s) of paint so you need to buy 1 gallon (s) which cost $30 dollers. ... Program finished with exit code 0 Press ENTER to exit console.

Please enter the width of the room in feet: 14.2, Please enter the length of the room in feet: 17.4 Please enter the height of the room in feet: 10.0, You need exactly 2.1977 gallon (s) of paint so you need to buy 3 gallon (s) which cost $81 dollers. ... Program finished with exit code 0 Press ENTER to exit console. I

Please enter the width of the room in feet: 25.3, Please enter the length of the room in feet: 30.6 Please enter the height of the room in feet: 12.0, You need exactly 5.28945 gallon(s) of paint so you need to buy 6 gallon (s) which cost $144 dollers. ... Program finished with exit code 0 Press ENTER to exit console.