Assignment #3 Part 1

#include <iostream>
#include <iomanip>
#include <cmath>


using namespace std;

 int main()

 {
     int grade;
     int counter = 0;
     int aValue = 0;
     int bValue = 0;
     int cValue = 0;
     int dValue = 0;
     int fValue = 0;
     double total = 0;

     cout << "Enter last semesters grades: " << endl;

     while ( (grade = cin.get() ) != EOF )

     {

        switch (grade)
        {
        case 'A':
        case 'a':
            aValue += 4;
            counter += 1;
            break;

         case 'B':
         case 'b':
             bValue += 3;
             counter += 1;
             break;

         case 'C':
         case 'c':
             cValue += 2;
             counter += 1;
             break;

         case 'D':
         case 'd':
             dValue +=1;
             counter += 1;
             break;

         case 'F':
         case 'f':
             fValue += 0;
             counter += 1;
             break;

         case '\n':
         case ' ':
             break;

         default:
             cout << "Incorrect letter grade" << endl;
             break;
        }
     }

     total = aValue + bValue + cValue + dValue + fValue;
     cout << setprecision(2) << fixed << total/counter  << endl;


    system ("pause");
    return 0;

 }