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

// file: gradefreq3.cc
// Author: D. Ramm;   Date: 10/27/96
// Collecting frequency data using a vector

// 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()
{
   Vector<int> frequ(14, 0); // initialize to 0
   string fname;
   int grade;

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

   ifstream data;
   data.open(fname);
   while ( data >> grade)
   {
      frequ[grade]++;
   }
   for (grade = 13; grade >= 0; grade--)
   {
      cout.width(3);
      cout << grade << " " << frequ[grade] << endl;
   }
   return 0;
}

Sample output:

gradefreq3
enter file name: grades
 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