% cat gradepretty.C

/* gradepretty - Calculate student grades based on partial scores

* The program will prompt for student grades until EOF is entered

* The final grade is 30% programs, 50% tests and 20% homework

* Grades are assigned based on the following scale:

*    >0.90 4.0
*    >0.80 3.0
*    >0.70 2.0
*    <0.60 0.0

*  Written by: C. Severance - Tue Dec  7 17:40:05 EST 1993 */

#include <iostream.h>

main () {

  float pper,tper,hper,percent,totper,aveper,gpa,totgpa,avegpa;
  int student,count;

/* Initialization and headings */

  totper = 0;
  totgpa=0;
  count = 0;
  cout << "Grade program - written by Charles Severance\n";

/* Read the three percentages.  Note that data is expected from */
/* a file so there is no prompt. */

  cout.setf(ios::fixed,ios::floatfield);

  while(1) {
    cin >> student >> pper >> tper >> hper;

    if ( cin.eof() ) break;

    count = count + 1;

    percent = pper * 0.30 + tper * 0.50 + hper * 0.20;
    totper = totper + percent;

/* Determine the final grade and add it to the running total for GPA */

    gpa = 0.0;
    if ( percent >= 0.90 ) {
      gpa = 4.0;
    } else if ( percent >= 0.80 ) {
      gpa = 3.0;
    } else if ( percent >= 0.70 ) {
      gpa = 2.0;
    }

    totgpa = totgpa + gpa;

/* Print out the student information */

    cout.width(7);
    cout << student << "   ";
    cout.width(10);cout.precision(2);
    cout << pper << "   ";
    cout.width(10);cout.precision(2);
    cout << tper << "   ";
    cout.width(10);cout.precision(2);
    cout << hper << "   ";
    cout.width(5);cout.precision(1);
    cout << gpa << "\n";

  } /* End while */

/* Calculate the averages */

  if ( count  == 0 ) {
    avegpa = 0.0;
    aveper = 0.0;
  } else {
    avegpa = totgpa/count;
    aveper = totper/count;
  }

/* Print them out */

  cout << "Average                             ";
  cout.width(10);cout.precision(2);
  cout << aveper << "   ";
  cout.width(5);cout.precision(1);
  cout << avegpa << "\n";
}
% g++ gradepretty.C
% cat gradepretty.dat
102434 0.80 0.90 0.95
928394 0.60 0.99 0.70
374374 1.00 0.50 1.00
222222 0.80 0.50 0.95
172387 0.92 0.92 1.00
% a.out < gradepretty.dat
Grade program - written by Charles Severance
 102434         0.80         0.90         0.95     3.0
 928394         0.60         0.99         0.70     3.0
 374374         1.00         0.50         1.00     2.0
 222222         0.80         0.50         0.95     0.0
 172387         0.92         0.92         1.00     4.0
Average                                   0.81     2.4
%