A painting company has determined that for every 110 square feet of wall space, one gallon of paint and eight hours of labor will be required. The company charges $25.00 per hour for labor. Write a modular program that allows the user to enter the number of rooms that are to be painted and the price of the paint per gallon. It should also ask for the square feet of wall space in each room. It should then display the following data: - The number of gallons of paint required - The hours of labor required - The cost of the paint - The labor charges - The total cost of the paint job Input validation: Do not accept a value less than 1 for the number of rooms. Do not accept a value less than$10.00 for the price of paint. Do not accept a negative value for square footage of wall space.

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Solution A

Solution B

Answered 6 months ago

Step 1

1 of 3

#include <iostream>

using namespace std;

Step 1

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#include <iostream>
#include <iomanip> //to format output
using namespace std;

//function prototype
void getData(int &numRooms, double &paintPrice, double &surface);
double calculatePaint(int numRooms, double surface);
double calculateLabor(int numRooms, double surface);
double calculatePaintCost(double, double);
double calculateLaborCost(double);

int main(){
    //declare variables needed to store input
    //and pass to other functions
    int numRooms;
    double paintPrice, surfacePerRoom;

    //call function getData
    getData(numRooms, paintPrice, surfacePerRoom);

    //format output
    cout << fixed << setprecision(2);

    //display number of gallons needed
    cout << calculatePaint(numRooms, surfacePerRoom) << " gallons of paint ";
    cout << "are required!\n";

    //display labor hours needed
    cout << calculateLabor(numRooms, surfacePerRoom) << " hours of labor ";
    cout << "are required!\n";

    //display total cost of paint
    cout << "The paint will cost $";
    cout << calculatePaintCost(calculatePaint(numRooms, surfacePerRoom), paintPrice);
    cout << ".\n";

    //display total cost of labor
    cout << "Labor charges are$";
    cout << calculateLaborCost(calculateLabor(numRooms, surfacePerRoom));
    cout << ".\n";

    //display grand total
    cout << "The grand total is $";
    cout << calculatePaintCost(calculatePaint(numRooms, surfacePerRoom), paintPrice) +
            calculateLaborCost(calculateLabor(numRooms, surfacePerRoom));
    cout << ".\n";

    //return 0 to mark successful termination of program
    return 0;
}

void getData(int &numRooms, double &paintPrice, double &surface){
    //prompt user to enter data
    //then read from keyboard
    cout << "How many rooms to paint?\n";
    cin >> numRooms;
    //validate input using while loop
    while(numRooms < 1){
        //print error message
        cout << "Please enter a number greater than or equal to 1!\n";
        cin >> numRooms;
    }

    cout << "What is the surface to be painted in each room in sq. ft?\n";
    cin >> surface;
    //validate input using while loop
    while(surface < 0){
        //print error message
        cout << "Please enter a nonnegative value!\n";
        cin >> surface;
    }

    cout << "What is the price per gallon of paint?\n";
    cin >> paintPrice;
    //validate input using while loop
    while(paintPrice < 10.00){
        //print error message
        cout << "Please enter a number greater than or equal to 10!\n";
        cin >> paintPrice;
    }

}

double calculatePaint(int numRooms, double surface){
    //divide by 110.00 to prevent
    //integer division
    return numRooms * surface / 110.00;
}

double calculateLabor(int numRooms, double surface){
    //divide by 110.00 to prevent
    //integer division
    return 8 * numRooms * surface / 110.00;
}

double calculatePaintCost(double paintGallons, double paintPrice){
    return paintGallons * paintPrice;
}

double calculateLaborCost(double laborHours){
    return laborHours * 25.00;
}