#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<conio.h>
 
#define max 3
 
typedef struct
{
	 char FName[24];
	 char LName[16];
	 char MI;
}name;
 
typedef struct
{
	 unsigned long ID;
	 name n;
	 char course[8];
	 int level;
}profile;
 
typedef struct
{
	 profile *p;
	 int last;
}student_record, *srptr;
 
void initialize(srptr *s);
void insert(srptr *s);
void display(srptr s);
void write_file(srptr s);
void read_file(srptr *s);
 
void initialize(srptr *s)
{
	 *s = (srptr) malloc(sizeof(student_record));
	 (*s)->p = (profile *) malloc(sizeof(profile) * max);
	 (*s)->last = -1;
}
 
void insert(srptr *s)
{
	 strcpy((*s)->p[++(*s)->last].n.FName, "Bradd");
	 strcpy((*s)->p[(*s)->last].n.LName, "Pitt");
	 (*s)->p[(*s)->last].n.MI = 'P';
	 (*s)->p[(*s)->last].ID = 7000000;
	 strcpy((*s)->p[(*s)->last].course, "BSIT");
	 (*s)->p[(*s)->last].level = 3;
 
	 strcpy((*s)->p[++(*s)->last].n.FName, "Angelina");
	 strcpy((*s)->p[(*s)->last].n.LName, "Jolie");
	 (*s)->p[(*s)->last].n.MI = 'M';
	 (*s)->p[(*s)->last].ID = 7111111;
	 strcpy((*s)->p[(*s)->last].course, "BSICT");
	 (*s)->p[(*s)->last].level = 1;
 
	 strcpy((*s)->p[++(*s)->last].n.FName, "Tom");
	 strcpy((*s)->p[(*s)->last].n.LName, "Cruise");
	 (*s)->p[(*s)->last].n.MI = 'A';
	 (*s)->p[(*s)->last].ID = 7222222;
	 strcpy((*s)->p[(*s)->last].course, "ACTMT");
	 (*s)->p[(*s)->last].level = 2;
}
 
void display(srptr s)
{
	 int ctr;
 
	 for(ctr = 0; ctr < max; ctr++)
	 {
		  printf("%d)\n", ctr + 1);
		  printf("%s %c. %s\n", s->p[ctr].n.FName, s->p[ctr].n.MI, s->p[ctr].n.LName);
		  printf("%li\n", s->p[ctr].ID);
		  printf("%s %d\n", s->p[ctr].course, s->p[ctr].level);
		  printf("\n");
	 }
}
 
void write_file(srptr s)
{
	 FILE *fp;
	 int ctr;
 
	 if((fp = fopen("test.dat", "wb")) == NULL)
		  printf("Cannot open file\n");
 
	 for(ctr = 0; ctr <= s->last; ctr++)
	 {
		  fwrite(&s->p[ctr].ID, sizeof(long), 1, fp);
		  fwrite(&s->p[ctr].n.FName, sizeof(char), strlen(s->p[ctr].n.FName), fp);
		  fwrite(&s->p[ctr].n.LName, sizeof(char), strlen(s->p[ctr].n.LName), fp);
		  fwrite(&s->p[ctr].n.MI, sizeof(char), 1, fp);
		  fwrite(&s->p[ctr].course, sizeof(char), strlen(s->p[ctr].course), fp);
		  fwrite(&s->p[ctr].level, sizeof(int), 1, fp);
	 }
	 printf("File Saved\n");
	 getch();
	 clrscr();
	 fclose(fp);
}
 
void read_file(srptr *s)
{
	 FILE *fp;
	 int ctr;
 
	 if((fp = fopen("test.dat", "rb")) == 0)
		  printf("File is empty\n");
 
	 for(ctr = 0; ctr < max; ctr++)
	 {
		  fread(&(*s)->p[ctr].ID, sizeof(long), 1, fp);
		  fread(&(*s)->p[ctr].n.FName, sizeof(char), strlen((*s)->p[ctr].n.FName), fp);
		  fread(&(*s)->p[ctr].n.LName, sizeof(char), strlen((*s)->p[ctr].n.LName), fp);
		  fread(&(*s)->p[ctr].n.MI, sizeof(char), 1, fp);
		  fread(&(*s)->p[ctr].course, sizeof(char), strlen((*s)->p[ctr].course), fp);
		  fread(&(*s)->p[ctr].level, sizeof(int), 1, fp);
		  (*s)->last++;
	 }
	 printf("File Loaded\n");
	 getch();
	 clrscr();
	 fclose(fp);
}
 
void main()
{
	 srptr s;
	 initialize(&s);
 
	 insert(&s);
 
	 write_file(s);
 
	 read_file(&s);
 
 
	 display(s);
}