#include <iostream.h>
#include <fstream.h>
#include "CPstring.h"

// file: gradefreq2.cc
// Author: D. Ramm;   Date: 10/27/96
// Collecting frequency data using switch

// Assume grades represented by integers as follows:
//   A+  13     B+  10   C+  7    D+  4    F+  1
//   A   12     B    9   C   6    D   3    F   0
//   A-  11     B-   8   C-  5    D-  2
// Essentially an expansion of the 4 point scale.

int main()
{
   int ap = 0, a = 0, am = 0, bp = 0, b = 0, bm = 0;
   int cp = 0, c = 0, cm = 0, dp = 0, d = 0, dm = 0;
   int fp = 0, f = 0;
   string fname;
   int grade;

   cout << "enter file name: ";
   cin >> fname;

   ifstream data;
   data.open(fname);
   while ( data >> grade)
   {

      switch (grade)
      {
         case 13: ap++; break;
         case 12: a++;  break;
         case 11: am++; break;
         case 10: bp++; break;
         case 9:  b++;  break;
         case 8:  bm++; break;
         case 7:  cp++; break;
         case 6:  c++;  break;
         case 5:  cm++; break;
         case 4:  dp++; break;
         case 3:  d++;  break;
         case 2:  dm++; break;
         case 1:  fp++; break;
         case 0:  f++;  break;
      }
   }
   cout << "Grade Distribution (A+ = 13, ..., F = 0)" << endl;
   cout << "13 " << ap << endl; cout << "12 " << a << endl;
   cout << "11 " << am << endl; cout << "10 " << bp << endl;
   cout << " 9 " << b << endl; cout << " 8 " << bm << endl;
   cout << " 7 " << cp << endl; cout << " 6 " << c << endl;
   cout << " 5 " << cm << endl; cout << " 4 " << dp << endl;
   cout << " 3 " << d << endl; cout << " 2 " << dm << endl;
   cout << " 1 " << fp << endl; cout << " 0 " << f << endl;
   return 0;
}

Sample output:

gradefreq2

enter file name: grades
Grade Distribution (A+ = 13, ..., F = 0)
13 3
12 4
11 6
10 7
 9 7
 8 4
 7 4
 6 3
 5 3
 4 2
 3 2
 2 2
 1 2
 0 3