#include<stdio.h>
#include<stdlib.h>
#define NUM 3
main ()
{
  FILE *fp1;
  char *temp;
  int i,j;
  struct rec{
      char id[10];
      char name[15];
      char department[15];    
  }record[NUM];
  printf("This programis to show the random file input & out put \n");
  if((fp1=fopen("f:\\infile.txt","wb"))==NULL)
  {
     printf("cannot open file");
     exit(1);    
  }
  for(i=0;i<NUM;i++)
  {
    printf("input id:");
    scanf("%s",record[i].id);
    printf("input name:");
    scanf("%s",record[i].name);
    printf("input department:");
    scanf("%s",record[i].department);
    fwrite(&record[i],sizeof(struct rec),1,fp1);    
  }
  fclose(fp1);
  if((fp1=fopen("f:\\infile.txt","rb+"))==NULL)
  {
    printf("cannot open file");
    exit(1);    
  }
  printf("****************************************************\n");
   printf("%-10s%-15s%-15s\n","id","name","department");
   printf("****************************************************\n");
   for(i=0;i<NUM;i++)
   {
       fread(&record[i],sizeof(struct rec),1,fp1);
       printf("%-10s%-15s%-15s\n",record[i].id,record[i].name,record[i].department);
   }
fseek(fp1,2*sizeof(struct rec),0);
fwrite(&record[1],sizeof(struct rec),1,fp1);
rewind(fp1);
printf("**********************************************************\n");
printf("%-10s%-15s%-10s\n","id","name","department");
printf("**********************************************************\n");
for(i=0;i<NUM;i++)
{
  fread(&record[i],sizeof(struct rec),1,fp1);
printf("%-10s%-15s%-15s\n",record[i].id,record[i].name,record[i].department);    
}
fclose(fp1);
scanf("%d",i);
}