Arrays and Functions

//  this program reads in grades, prints the grades, and calculates and
//  prints the average grade. the user can enter as many grades as
//  he or she wishes.

#include <iostream.h>
#include <iomanip.h>

void readGrades(int [],int&);
void printGrades(int [],int);
float calcAvgGrade(int[],int);
int main()
{
   int grades[30];
   int count;

//  set up output to print floating point values with one decimal place
   cout << setiosflags(ios::fixed);
   cout << setiosflags(ios::showpoint);
   cout << setprecision(1);

   readGrades(grades,count);
   printGrades(grades,count);
   cout << endl;
   cout << "The average grade is : " << calcAvgGrade(grades,count) << endl;
}

//  read in the grades, stop reading when 0 is entered, and return
//  count of grades read in
void readGrades(int grades[],int& count)
{
   count = 0;
   cout << "Enter grade (enter 0 to end): ";
   cin >> grades[0];
   while (grades[count] != 0)
   {
      count++;
      cout << "Enter grade (enter 0 to end): ";
      cin >> grades[count];
   }
}

//  calculate and return the average grade
float calcAvgGrade(int grades[],int count)
{
   int sum;
   float average;
   sum = 0;
   for (int i = 0 ; i < count ; i++)
      sum = sum + grades[i];
   average = float(sum) / count;
   return average;
}

//  print the grades
void printGrades(int grades[],int count)
{
   cout << endl << endl;
   cout << "The grades are: " << endl;
   for (int i = 0 ; i < count ; i++)
      cout << setw(7) << grades[i] << endl;
}

Sample Execution

Enter grade (enter 0 to end): 88
Enter grade (enter 0 to end): 71
Enter grade (enter 0 to end): 76
Enter grade (enter 0 to end): 83
Enter grade (enter 0 to end): 92
Enter grade (enter 0 to end): 85
Enter grade (enter 0 to end): 94
Enter grade (enter 0 to end): 0


The grades are:
     88
     71
     76
     83
     92
     85
     94

The average grade is : 84.1

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