#include <stdio.h>

int main(void){
  FILE *f;
  int m[]={10, 20, 30, 40, 50};
  int nr;
  f=fopen("temp.dat", "wb");
  if(!f){
    printf("kirjutusprobleem\n");
    return 1;
  }
  printf("asukoht peale avamist: %ld\n", ftell(f)); //long decimal
  fwrite(m, sizeof(int), 5, f);
  printf("peale kirjutamist: %ld\n", ftell(f));
  if(fclose(f)){printf("Probleem sulgemisel\n");}


  f=fopen("temp.dat", "rb+");
  printf("peale avamist: %ld\n", ftell(f));

  fread(&nr, sizeof(int), 1, f);
  printf("arv %d, nihe %ld\n", nr, ftell(f));

  fread(m, sizeof(int), 2, f);
  printf("m[1]=%d: , fail: %ld\n", m[1], ftell(f));

  rewind(f);
  printf("Algusse liikudes: %ld\n", ftell(f));

  fread(m, sizeof(int), 5, f);
  printf("m[1]=%d: , fail: %ld\n", m[1], ftell(f));

  fseek(f, 2*sizeof(int), SEEK_SET); //SEEK_SET - faili algusest  
  printf("Kohal 2: %ld\n", ftell(f));

  fread(&nr, sizeof(int), 1, f);
  printf("arv %d, nihe %ld\n", nr, ftell(f));
  
  nr=13;
  fwrite(&nr, sizeof(int), 1, f);
  fclose(f);
  
  return 0;
}