/*
 * struct.c -- practice with structures in C.  A structure is a
 * special data type, similar to the data attributes of a Java or C++ class.
 * A single structure usually consists of several fields of different
 * basic types, such as 3 integers, a string and a floating-point number.
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

struct student
{
  char name[30];
  int midterm;
  int final;
  int term_paper;
  double average;
};

int get_input(struct student []);
void compute_averages (struct student[], int);
void output (struct student[], int);

main()
{
  struct student my_class[20];
  int num_students;

  num_students = get_input (my_class);
  compute_averages (my_class, num_students);
  output (my_class, num_students);
}

/*
 * the get_input() function reads lines from standard input,
 * and updates corresponding fields of each student.  The function
 * returns the number of students.
 *
 * The condition "feof (stdin)" tests to see if we have reached the
 * end of standard input.
 * 
 * C does not have a string type.  I'm declaring the line to be an array
 * of up to 82 characters.  Why 82?  Because I want to allocate enough
 * space for up to 80 characters on a line, plus the newline character,
 * plus the null character that must appear at the end of a string in C.
 * In practice, however, our lines won't be this long!
 *
 * It is a good idea to use fgets() to read a line of text.  It takes
 * 3 parameters:  the name of the "string" variable, the maximum size,
 * and the file you are reading from.  If that "file" is actually just
 * interactive input, then say stdin, which stands for "standard input."
 */
int get_input(struct student class[])
{
  int i;
  char input_line[82];

  for (i = 0;  ; ++i)
  {
    fgets(input_line, 82, stdin);
    if (feof (stdin))
      break;

    strcpy (class[i].name, strtok(input_line, ":"));
    class[i].midterm = atoi (strtok (0, " "));
    class[i].final = atoi (strtok (0, " "));
    class[i].term_paper = atoi (strtok (0, " "));
  }

  return i;
}

void compute_averages (struct student class[], int num_students)
{
}

void output(struct student class[], int num_students)
{
  int i;

  for (i = 0; i < num_students; ++i)
    printf ("%-20s %3d %3d %3d %5.1f\n", class[i].name, class[i].midterm,
            class[i].final, class[i].term_paper, class[i].average);
}