- int i = frac.index_i ('/');
- int l = frac.length_i ();
- String left = frac.left_str (i);
- String right = frac.right_str (l - i - 1);
+ int i = frac.index ('/');
+ int l = frac.length ();
+ String left = frac.left_string (i);
+ String right = frac.right_string (l - i - 1);