Question

**C++**

Output each floating-point value with two digits after the decimal point, which can be achieved by executing
cout << fixed << setprecision(2); once before all other cout statements.

(1) Prompt the user to input a wall's height and width. Calculate and output the wall's area. (2 pts)

Note: This zyLab outputs a newline after each user-input prompt. For convenience in the examples below, the user's input value is shown on the next line, but such values don't actually appear as output when the program runs.

Enter wall height (feet):
12.0
Enter wall width (feet):
15.0
Wall area: 180.00 square feet

(2) Extend to also calculate and output the amount of paint in gallons needed to paint the wall. Assume a gallon of paint covers 350 square feet. Store this value using a const double variable. (2 pts)

Enter wall height (feet):
12.0
Enter wall width (feet):
15.0
Wall area: 180.00 square feet
Paint needed: 0.51 gallons

(3) Extend to also calculate and output the number of 1 gallon cans needed to paint the wall. Hint: Use a math function to round up to the nearest gallon. (2 pts)

Enter wall height (feet):
12.0
Enter wall width (feet):
15.0
Wall area: 180.00 square feet
Paint needed: 0.51 gallons
Cans needed: 1 can(s)

Answer 1

#include <iostream>
#include <iomanip>     // Header file needed for setprecision
#include<math.h>      // Header file needed for round function

int main() {
   
    float height,width;      // Variables declaration
    double area;
    int cans;

    
    std::cout<<"Enter wall height(feet):\n";
    std::cin>>height;
    std::cout<<"Enter wall width(feet):\n";
    std::cin>>width;
    
    

    area=height*width;
    const double paintgallons=area/350;      // constant double variable
    cans=round(paintgallons);


    
    std::cout << std::fixed<<std::setprecision(2);
    std::cout<<"Wall area: "<<area<<" square feet\n";      // Area of wall
    
    std::cout << std::fixed<<std::setprecision(2);
    std::cout<<"Paint needed: "<<paintgallons<<" gallons\n";   // Paint to be needed. 
    
    std::cout << std::fixed<<std::setprecision(2);
    std::cout<<"Cans needed: "<<cans<<" can(s)\n";     // cans to be needed.
    
       
    
    return 0;

}

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OUTPUT :

Enter wall height(feet):
12.0
Enter wall width(feet):
15.0
Wall area: 180.00 square feet
Paint needed: 0.51 gallons
Cans needed: 1 can(s)

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