// file: my first program
//
#include <stdio.h>
//#include <stdlib.h>
//#include <string.h>

// my main program starts here
//
int main(int argc, char** argv) {

  // declare local variables
  //
  float sum = 27.272727272;

  // open a file
  //
  FILE* fp = fopen(argv[1], "w");
  if (fp == (FILE*)NULL) {
    fprintf(stdout, "%s: error opening file\n", argv[0]);
  }

  // print to the terminal as ASCII
  //
  //  fprintf(fp, "%10.4f\n", sum);

  // print to the file as binary
  //
  float a[] = {1, 2, 3};
  fwrite(a, sizeof(float), 3, fp);

  // close the file
  //
  fclose(fp);

  FILE* fp_r = fopen(argv[1], "r");
  float joe[3];
  fprintf(stdout, "file position = %d\n", ftell(fp_r));
  long nitems_read = fread(joe, sizeof(float), 3, fp_r);
  nitems_read = fread(joe, sizeof(float), 3, fp_r);
  fprintf(stdout, "file position = %d(%d)\n", ftell(fp_r), nitems_read);

  //  fprintf(stdout, "number of items read = %d\n",
  //	  fread(joe, sizeof(float), 3, fp_r));

  fclose(fp_r);

  for (long i = 0; i < 3; i++) {
    fprintf(stdout, "%d: %f\n", i, joe[i]);
  }

  // exit gracefully
  //
  return 0;
}