Guys plz can u tell me what is the actual work of Return operator (\r) ???

Answer 1

Do you mean escape character? Depends, but among other things it represents:
\r = CR (Carriage Return) → Used as a new line character in Mac OS before X
\n = LF (Line Feed) → Used as a new line character in Unix/Mac OS X
\r\n = CR + LF → Used as a new line character in Windows