Using C++, Write a program segment that dynamically allocates an array large eno

Question

Using C++,

Write a program segment that dynamically allocates an array large enough to hold a user defined number of (double) test scores. Once all the scores are entered, the array should be passed to a function that calculates and returns the average score. Use Pointer notation whenever possible.

double calculateAverage(function parameter goes here) //

int main()

{ int size;

double * ptrScores;

// complete rest of the main function following the directions above

}

double calculateAverage(function parameter goes here)

{

// complete the rest of this function following the directions above

}   

Explanation / Answer

Program:

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

double calcAverage(double, int);
void bubbleSort(double scores[], int numScores);

int main()
{
double *scores,    // To dynamically allocate an array
       total = 0.0, // Accumulator
       average;    // To hold average scores
int numScores,        // To hold the number of days of scores
   count;            // Counter variable

// Get the number of days of scores.
cout << "How many days of test scores do you wish ";
cout << "to process? ";
cin >> numScores;

// Dynamically allocate an array large enough to hold
// that many days of scores amounts.
scores = new double[numScores];

// Get the scores figures for each day.
cout << "Enter the test scores below. ";
for (count = 0; count < numScores; count++)
{
cout << "Day " << (count + 1) << ": ";
cin >> scores[count];
}
// Calculate the total scores
for (count = 0; count < numScores; count++)
{
total += scores[count];
}

bubbleSort(scores,numScores);
average = calcAverage(total, numScores);

cout << endl;
for (count = 0; count < numScores; count++)
{
cout<<"Day "<<(count+1)<<": "<< *(scores + count) <<endl;
}

// Display the results
cout << fixed << showpoint << setprecision(2);
cout << "Average Test Score: " << average << "%" << endl;

// Free dynamically allocated memory
delete [] scores;
scores = 0; // Make scores point to null.

   return 0;
}

double calcAverage(double total, int numScores)
{
double avg;
// Calculate the average scores per day
avg = total / numScores;
return avg;
}

void bubbleSort(double array[], int size)
{
bool swap;
int temp;
   do
   {
   swap = false;
       for (int count = 0; count < (size - 1); count++)
       {
           if (array[count] > array[count + 1])
           {
               temp = array[count];
               array[count] = array[count + 1];
               array[count + 1] = temp;
               swap = true;
           }
       }
   } while (swap);
}

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