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

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

  long N = atoi(argv[2]);
  float a[N], b[N];

  FILE* fp = fopen(argv[1], "w");
  for (long i = 0; i < N; i++) {
    a[i] = i;
  }
  fwrite(a, sizeof(float), N, fp);
  fclose(fp);

  fp = fopen(argv[1], "r");
  fprintf(stdout, "the number of items read was %d\n", fread(b, sizeof(float), N, fp));
  fclose(fp);

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

  // exit gracefully
  //
  return 0;
}