/* lab 2 B */
#include <stdio.h>

/* correct the program */
int main(int argc, char *argv[])
{
  int	num_subj;
  float in_gp, sum_gp = 0.0;
  char	in_grade, grade[10];
  int	i;

  /* argv[0] is the name of the program */
  printf("This program is %s\n",argv[0]);
  num_subj = argc-1;
  printf("There are %d subjects\n",num_subj);

  for (i = 1; i <= num_subj; i++) {
      in_grade = argv[i][0]; /* read first character */
      switch (in_grade) {
        case 'A': in_gp = 4.0; break;
        case 'B': in_gp = 3.0; break;
        case 'C': in_gp = 2.0; break;
        case 'D': in_gp = 1.0; break;
        case 'F': in_gp = 0.0; break;
        default: printf("Wrong grade %s\n",argv[i]);
      }
      if (argv[i][1] == '+') in_gp = in_gp + 0.5;
      sum_gp = sum_gp + in_gp;
    }

  printf("Your GPA for %d subjects is %5.2f\n",num_subj,sum_gp/num_subj);
}