// file: lecture_07/example.cc
//

// system include files
//
#include <stdio.h>
#include <stdlib.h>
#include <math.h>

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

  // open a file
  //
  FILE* fp = fopen(argv[1], "r");

  if (fp == (FILE*)NULL) {
    fprintf(stdout, "<%s> error on file (%s)\n", argv[0], argv[1]);
    return(-1);
  }

  if (argc < 2) {
    fprintf(stdout, "<%s> insufficient arguments (%d)\n", argv[0], argc);
    return(-1);
  }    

  float x = 27.2727;
  float y = -3.0;

  /*
  // do a loop
  //
  for (long i = 0; i < 10; i++) {
    fprintf(stdout, "%d: hello\n", i);
    if ((i != 7) && (i != 3)) {
      fprintf(stdout, "***> special case\n", i);
    }
  }
  */
  
  long i = 0;
  char buf[999];
  while (fgets(buf, 999, fp)) {
    fprintf(stdout, "%d: %s\n", i++, buf);
  }

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

  // exit gracefully
  //
  return(0);
}