/* Program for computing letter grades in CPSC 441 */
/* This version also does class averages and stdev */
/* Usage: cc -o compute compute.c -lm              */
/*        ./compute < marks.txt                    */
/* Written by Carey Williamson     January 5, 2014 */

#include <stdio.h>
#include <math.h>

#define STRLEN 20

main()
  {
    char fname[STRLEN], lname[STRLEN];
    int id;
    float a1, a2, a3, a4;
    float quiz;
    float mid;
    float fin;
    float tot;
    char grade;
    char flag;
    float tota1, tota2, tota3, tota4, totq, totm, totf, tott;
    float totsqa1, totsqa2, totsqa3, totsqa4, totsqq, totsqm, totsqf, totsqt;
    float meana1, meana2, meana3, meana4, meanq, meanm, meanf, meant;
    float vara1, vara2, vara3, vara4, varq, varm, varf, vart;
    int count;

    /* Initialization */
    count = 0;
    tota1 = 0.0;
    tota2 = 0.0;
    tota3 = 0.0;
    tota4 = 0.0;
    totq = 0.0;
    totm = 0.0;
    totf = 0.0;
    tott = 0.0;
    totsqa1 = 0.0;
    totsqa2 = 0.0;
    totsqa3 = 0.0;
    totsqa4 = 0.0;
    totsqq = 0.0;
    totsqm = 0.0;
    totsqf = 0.0;
    totsqt = 0.0;

    while( scanf("%s %s %d %f %f %f %f %f %f %f\n",
		 fname, lname, &id, &a1, &a2, &a3, &a4, &quiz, &mid, &fin) == 10 )
      {
	tot = a1 + a2 + a3 + a4;
	tot /= 4;
	tot += 0.08*100.0*quiz/32.0;
	tot += 0.20 * mid;
	tot += 0.40 * fin;

	tota1 += a1;
	tota2 += a2;
	tota3 += a3;
	tota4 += a4;
	totq += quiz;
	totm += mid;
	totf += fin;
	tott += tot;

	totsqa1 += a1*a1;
	totsqa2 += a2*a2;
	totsqa3 += a3*a3;
	totsqa4 += a4*a4;
	totsqq += quiz*quiz;
	totsqm += mid*mid;
	totsqf += fin*fin;
	totsqt += tot*tot;

	count++;

	grade = 'F';
	flag = ' ';
	if( tot >= 50 )
	  {
	    grade = 'D';
	    flag = ' ';
	  }
	if( tot >= 55 )
	  {
	    grade = 'C';
	    flag = '-';
	  }
	if( tot >= 60 )
	  {
	    grade = 'C';
	    flag = ' ';
	  }
	if( tot >= 65 )
	  {
	    grade = 'C';
	    flag = '+';
	  }
	if( tot >= 70 )
	  {
	    grade = 'B';
	    flag = '-';
	  }
	if( tot >= 75 )
	  {
	    grade = 'B';
	    flag = ' ';
	  }
	if( tot >= 80 )
	  {
	    grade = 'B';
	    flag = '+';
	  }
	if( tot >= 85 )
	  {
	    grade = 'A';
	    flag = '-';
	  }
	if( tot >= 90 )
	  {
	    grade = 'A';
	    flag = ' ';
	  }
	if( tot >= 95 )
	  {
	    grade = 'A';
	    flag = '+';
	  }
	if( fin < 0 )
	  {
	    grade = 'W';
	    flag = ' ';
	  }
	printf("%20s %-15s %4.1f %4.1f %4.1f %4.1f  %4.1f %5.1f %5.1f %5.1f %c%c\n",
	       fname, lname, a1, a2, a3, a4, quiz, mid, fin, tot, grade, flag);
      }
    if( count > 0 )
      {
	meana1 = tota1/count;
	meana2 = tota2/count;
	meana3 = tota3/count;
	meana4 = tota4/count;
	meanq = totq/count;
	meanm = totm/count;
	meanf = totf/count;
	meant = tott/count;

	vara1 = (totsqa1/count)-(meana1*meana1);
	vara2 = (totsqa2/count)-(meana2*meana2);
	vara3 = (totsqa3/count)-(meana3*meana3);
	vara4 = (totsqa4/count)-(meana4*meana4);
	varq = (totsqq/count)-(meanq*meanq);
	varm = (totsqm/count)-(meanm*meanm);
	varf = (totsqf/count)-(meanf*meanf);
	vart = (totsqt/count)-(meant*meant);
      }
    printf("              ---------------------------------------------------------------------\n");
    printf("              Class Average (n=%3d)  %4.1f %4.1f %4.1f %4.1f  %4.1f %5.1f %5.1f %5.1f\n",
	   count, meana1, meana2, meana3, meana4, meanq, meanm, meanf, meant);
    printf("              Standard Deviation     %4.1f %4.1f %4.1f %4.1f  %4.1f %5.1f %5.1f %5.1f\n",
	   sqrt(vara1), sqrt(vara2), sqrt(vara3), sqrt(vara4),
	   sqrt(varq), sqrt(varm), sqrt(varf), sqrt(vart));
  }