public static str operator +(str lineFirst, str lineSecond) { str result = new str(lineFirst.len() + lineSecond.len()); for (int i = 0; i < result.len(); i++) { if (i < lineFirst.len()) { result.line[i] = lineFirst.line[i]; } else { result.line[i] = lineSecond.line[i - lineFirst.len()]; } } return(result); }