Question

Problem: Write a short C++ program that gets the side of a cube and the radius of a sphere from the keyboard and writes to a file the surfaces of these shapes.

           

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Your task: implement in C++ the algorithm solution shown below.

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Part A (79 points)

Algorithm solution (in pseudocode):

To accomplish this task, your program will have to take the following steps:

1. Declare a variable named outFile that represents an output stream.

2. Declare a named constant PI that holds value 3.141592.

3. Declare variables named side, radius, s_cube, and s_sphere that hold double precision real numbers.

4. Open the file output.txt.

5. Prompt the user to “Enter side of cube: “.

6. Read from keyboard the value entered by the user and store it in side.

7. Prompt the user to “Enter radius of sphere: “.

8. Read from keyboard the value entered by the user and store it in radius.

9. Calculate the surface of the cube using the formula 6 * s ² (where s is the side of the cube)

and assign the result to s_cube.

10. Calculate the surface of the sphere using the formula 4 * pi* r ² (where r is the radius of the sphere) and assign the result to s_sphere.

11. Format the output to display the numbers in fixed format with two decimal digits.

12. Print to output.txt the message

“The surface of a cube of sides “,side, “ is “, s_cube.

“The surface of a sphere of radius “,radius, “ is “,s_sphere.

13. Close the file.

To calculate the squares of a number you must define a value-returning function named square( ) that receives a real number and returns its square as a real number. Then use it to calculate the squares of side and radius. Do NOT use pow() in your program.

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Part B (10 points)

Modify the above program so that function square( ) rounds off the value to the nearest one hundredths (second decimal digit) before returning it.

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Part C (11 points)

Modify the above program so that, instead of calculating the surfaces in main( ) you use a couple of value_returning functions named cube_surf( ) and sphere_surf( ) to do it. The former must receive the side of the cube while the latter must receive the radius of the sphere.

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Example:

Enter side of cube: 2.123456789 (entered by the user at the keyboard)

Enter radius of sphere: 3.987654321 (entered by the user at the keyboard)

Content of output.txt after running part A solution

The surface of a cube of sides 2.12 is 27.05

The surface of a sphere of radius 3.99 is 199.82

            Your program must compile without errors or warnings.

Answer 1

Thanks for the question.

Here is the completed code for this problem.

Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change.

If you are satisfied with the solution, please rate the answer. Thanks

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#include<iostream>
#include<fstream>

#include<iomanip>
using namespace std;

// PART C
double cube_surf(double side){
   return 6*side*side;
}

double sphere_surf(double radius){
   const double PI = 3.141592;
   return 4*PI*radius*radius;
}

int main(){
  
   ofstream outFile;
  
   double side, radius, s_cube,s_sphere;
   outFile.open("output.txt");
  
   cout<<"Enter side of cube: "; cin>>side;
   cout<<"Enter radius of sphere: ";cin>>radius;
  
   s_cube = cube_surf(side);
   s_sphere = sphere_surf(radius);
  
   // PART B the below line square off to 2 decimals
   outFile<<fixed<<setprecision(2)<<showpoint;
   outFile<<"The surface of a cube of sides "<<side<<" is "<<s_cube<<endl;
   outFile<<"The surface of a sphere of radius "<<radius<<" is "<<s_sphere;
   outFile.close();
  
}

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thanks : )