#include <stdio.h>
#define STUD_COUNT 3

typedef struct Student student;

struct Student
{ 
  int ID;
  char Name[40];
  char Grade;
  student *next;
};

struct Student students[STUD_COUNT]; 

void AssignStudent(struct Student *p, int ID, char Name[40], char Grade, struct Student *pn)
{
   p->ID = ID;
   strcpy(p->Name,Name);
   p->Grade = Grade;
   p->next = pn;
}

void PrintStudent(struct Student *p)
{
    printf("ID: %d\n", p->ID);
    printf("Name: %s\n", p->Name);
    printf("Grade: %c\n", p->Grade);
}

int main(void)
{
  struct Student *p = students;
  struct Student *pn = p+2;
  int i = 0;
  
  AssignStudent(p++, 1001, "Jane Doe", 'A', pn);
  AssignStudent(p++, 1002, "Mary Kane", 'A', pn--);
  AssignStudent(p++, 1003, "Ruth Beal", 'B', pn);
  
  p = &students[0];
  for (i=0; i<STUD_COUNT; i++)
  {
    PrintStudent(p);
    p = p->next;
  }
  return;
}