Introduction with Sample Code: Exception


Exception terminates execution on error

      # raises exception if path is not valid
      f = open(path)
      No such file or directory (Errno::ENOENT)

better than

      FILE *f = fopen(path, "r");
      if (f == NULL) {
        fprintf(stderr, "can't open file: %s\n", path);
        exit(1);
      }