Write a program that takes as input an array of 5 numbers and then displays the

Question

Write a program that takes as input an array of 5 numbers and then displays the minimum, maximum, mean, standard deviation and sorted array of the numbers. You are expected to write a class (.cpp) and header (.h) file called Numbers whose member functions implement each of the above mentioned functionality. You should also implement a driver.cpp which tests each of this different functionality.

I wrote the code for this project, but now I need to change it to object oriented. I need to change the code to a class with the 3 different files.

#include <iostream>
#include <iomanip>
using namespace std;

double mean(double[], int, double&);
double standardd(double[], int, double);
double calc(int, double);
char letter(double);
int main()
{
   double x[10];
   int i = 0, j,h;
   double average, sd, sum = 0;

   cout << "How many scores will you enter: ";
   cin >> h;

   for (int k = 0; k < h; k++)
   {
       cout << "Enter score " << (i + 1) << ": ";
       cin >> x[i];
       i++;
   }
  
   average = mean(x, i, sum);                       // calls the mean function to set the average score.
   sd = standardd(x, i, average);                   // calls the standardd function to set the standard diviation
   cout << " Average: " << average << " ";
   cout << "Standard Deviation: " << sd << " ";
   cout << setprecision(1) << fixed;
   cout << "Letter Grades: " << endl << endl;
   for (j = 0; j < i; j++)
       cout << x[j] << " --> " << letter(x[j]) << endl; // outputs the letter grades
  
   return 0;
}
char letter(double x) // sets letter grades
{
   if (x >= 90)
       return 'A';
   else if (x >= 80)
       return 'B';
   else if (x >= 70)
       return 'C';
   else if (x >= 60)
       return 'D';
   else
       return 'F';
}

double mean(double x[], int n, double& sum) // Calculates the mean adding the scoresand dividing the sum by the number of scores.
{                                           // returns the meant to the average variable.
   int i;
   for (i = 0; i < n; i++)
       sum += x[i];
   return (sum / n);
}
double calc(double x, double avg)           // calculates the squre of (score - average) for each score.
{
   double temp;
   temp = x - avg;
   return temp*temp;
}
double standardd(double x[], int n, double average) // calculates the starndard diviation
{                                                   // calls calc function to get the square of (score - average) for each score.
   double mean, sum = 0;                           // adds the values of the squares and divides them by the number of scores.
   int i;                                           // sets that value into mean variable
   for (i = 0; i<n; i++)
       sum += calc(x[i], average);
   mean = sum / n;                                   // calculates the square root of the mean
   return sqrt(mean);  
}

Explanation / Answer

#include

#include

#include
#include
using namespace std;

double Numbers::mean(double x[], int n, double& sum)

{                                           // returns the mean to the average variable.
   int i;
   for (i = 0; i < n; i++)
       sum += x[i];
   return (sum / n);
}
double Numbers::calc(double x, double avg)           // calculates the squre of (score - average) for each score.
{
   double temp;
   temp = x - avg;
   return temp*temp;
}
double Numbers ::standardd(double x[], int n, double average) // calculates the starndard diviation
{                                                   // calls calc function to get the square of (score - average) for each score.
   double mean, sum = 0;                           // adds the values of the squares and divides them by the number of scores.
   int i;                                           // sets that value into mean variable
   for (i = 0; i        sum += calc(x[i], average);
   mean = sum / n;                                   // calculates the square root of the mean
   return sqrt(mean);  
}

char Numbers::letter(double x) // sets letter grades
{
   if (x >= 90)
       return 'A';
   else if (x >= 80)
       return 'B';
   else if (x >= 70)
       return 'C';
   else if (x >= 60)
       return 'D';
   else
       return 'F';
}

int main()
{ Numbers n;
   double x[10];
   int i = 0, j,h;
   double average, sd, sum = 0;

   cout << "How many scores will you enter: ";
   cin >> h;

   for (int k = 0; k < h; k++)
   {
       cout << "Enter score " << (i + 1) << ": ";
       cin >> x[i];
       i++;
   }
  
   average =n.mean(x, i, sum);                       // calls the mean function to set the average score.
   sd = n.standardd(x, i, average);                   // calls the standardd function to set the standard diviation
   cout << " Average: " << average << " ";
   cout << "Standard Deviation: " << sd << " ";
   cout << setprecision(1) << fixed;
   cout << "Letter Grades: " << endl << endl;
   for (j = 0; j < i; j++)
       cout << x[j] << " --> " << n.letter(x[j]) << endl; // outputs the letter grades
  
   return 0;
}

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