// file: lecture_08/example.cc
//

// local include files
//
#include "example.h"

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

  // grab a value from the command line
  //
  long N = atoi(argv[1]);

  /*
  for (long i = 0; i < N; i++) {

    // check the value of i
    //
    if (i < (long)2) {
      fprintf(stdout, "i [%d] is less than 2 (%d)\n", i, N);
    }
    else if (i < (long)4) {
      fprintf(stdout, "it is a great day for a quiz\n");
    }
    else if (i == (long)5) {
      fprintf(stdout, "i is equal to 5\n");      
    }
    else if (i != (long)6) {
      fprintf(stdout, "i (%d) is not 6\n", i);
    }
    else {
      fprintf(stdout, "*** warning *** (%d)\n", i);
    }

    fprintf(stdout, "done with if/else\n");
  }
  */
  
  // demonstrate logical operators
  //
  long M = atoi(argv[2]);

  if (N == M) {
    fprintf(stdout, "N == M\n");
  }
  else if ((N % 2) && (M % 2)) {
    fprintf(stdout, "both N and M fail the modulo operator\n");
  }
  else if ((N % 2) || (M % 2)) {
    fprintf(stdout, "either N or M failed the modulo operator\n");
  }
  else if ((N != M) || (N % 2) && (M % 2) && (N > M)) {
    fprintf(stdout, "N and M are not equal\n");
  }

  /*
    some useful code

  // open a file
  //
  bool status = false;
  FILE* fp = fopen(argv[1], "r");
  if (fp == (FILE*)NULL) {
    fprintf(stdout, "%s: my program failed to open file (%s)\n", argv[0], argv[1]);
    exit(0);
  }
  
  // let's read the file line by line
  //
  long i = 0;
  char buf[999];
  while (fgets(buf, 999, fp)) {
    fprintf(stdout, "%d: %s", i++, buf);
  }

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

  */

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