/* Filename: RANSTRS.C */
// Writes an array of ten structures to a disk
// file and then rereads that file randomly.
#include <stdio.h>
#include <iostream.h>
#include <stdlib.h>
struct cafeSt {
  char name[15];
  float avPrice;
  int seats;
};

void prStruct(struct cafeSt prVar);
void pKey(void);

FILE * fPtr;

main()
{
  int ctr;
  // Keep the data alphabetical and sequential to
  // help verify that the data is read properly.
  struct cafeSt cafes[10] = {{"Adam's Mark", 12.95, 135},
                             {"Berryhill", 20.15, 78},
                             {"Capricorn's", 18.40, 101},
                             {"Daybreak", 3.69, 63},
                             {"Even Steven", 13.90, 45},
                             {"Fike's Foods", 48.51, 73},
                             {"Great Gobs", 8.97, 28},
                             {"Ham Heaven", 5.49, 65},
                             {"Ike's Chili", 3.65, 40},
                             {"Jan's Drinks", 1.75, 25}};
  struct cafeSt cafesNew[10];  // A second uninitialized array
  struct cafeSt aVar;  // A single structure variable

  
  puts("Getting ready to write the data...");
  // Didn't open the file until ready to write
  fPtr = fopen("cafe.dat", "w+");

    // A single function call writes all the data
  fwrite(cafes, sizeof(cafes), 1, fPtr);
  puts("Just wrote the data");
  fclose(fPtr);

  // Open the file again to show that the fwrite() worked
  fPtr = fopen("cafe.dat", "r+");

  fread(cafesNew, sizeof(cafesNew), 1, fPtr);

  for (ctr=0; ctr<10; ctr++)
    { prStruct(cafesNew[ctr]);
      if (ctr==4)
	{ pKey(); }
    }

  fseek(fPtr, (4L * sizeof(aVar)), SEEK_SET); // Fifth cafe
  fread(&aVar, sizeof(aVar), 1, fPtr);
  printf("\nFifth structure:");
  prStruct(aVar);

  fseek(fPtr, (-3L * sizeof(aVar)), SEEK_CUR); // Third cafe
  fread(&aVar, sizeof(aVar), 1, fPtr);
  printf("\nThird structure:");
  prStruct(aVar);

  fseek(fPtr, -1L * sizeof(aVar), SEEK_END); // Last cafe
  fread(&aVar, sizeof(aVar), 1, fPtr);
  printf("\nLast structure:");
  prStruct(aVar);

  fclose(fPtr);
  pKey();
  return 0;
}
//**********************************************************
void prStruct(struct cafeSt prVar)
{
  printf("\nName: %s\n", prVar.name);
  printf("Average menu price: %.2f\n", prVar.avPrice);
  printf("Seating: %d\n", prVar.seats);
  return;
}
//**********************************************************
void pKey(void)
{ // Gives the user a chance to pause
  char pause; 
  printf("\nPress any char then the Enter key to continue...");
  cin >> pause; 
 
return;
}