question about some variables in my code

Hello guys!

I want to program something that tells me how many gallons of paint I need and what the total cost of the painting . I gotta say I am new to this, I hope the question dosen't seem that silly:)

Code:

`// Headers and Other Technical Items`

#include <iostream>

using namespace std;

// Function Prototypes

void pause(void);

//

double length;

double width;

double height;

double price_gal_paint;

int coverage_gal_paint;

double total_area;

int total_gal_paint;

double total_cost;

//******************************************************

// main

//******************************************************

int main(void)

{

// Input

cout << "\nEnter the price of 1 gallon of paint";

cin >> price_gal_paint;

cout << "\nEnter the length of the house ";

cin >> length;

cout << "\nEnter the width of the house ";

cin >> width;

cout << "\nEnter the height of the house ";

cin >> height;

cout << "\nEnter the amount of square foot one gallon will cover ";

cin >> coverage_gal_paint;

// Process

// calculate the total area of the building by

x = length * height * 2 ;

y = width * height * 2;

total_area = x + y;

//calculate the number of gallons of paint needed by

total_gal_paint = total_area / coverage_gal_paint;

total_gal_paint = total_area / coverage_gal_paint + 0.9999;

total_cost = total_gal_paint * price_gal_pain;

// Output

cout << "\nThe number of gallons of paint is -------->: ";

cout << answer;

cout << "\nThe total cost of the paint is -------->: ";

cout << answer;

pause();

return 0;

}

//******************************************************

// pause

//******************************************************

void pause(void)

{

cout << "\n\n";

system("PAUSE");

cout << "\n\n";

return;

}

I hope everything is right. But I do have a question about the following code..

Code:

` // calculate the total area of the building by`

x = length * height * 2 ;

y = width * height * 2;

total_area = x + y;

I know it cant be just x and y now. But if I did total_area for x and y it wouldn't calculate it right. I think I have enough variables.. I don't know.. I kinda don't know how do do this part.

I believe I need to more variables for this..?

Thank you!!