I have been trying to find out the solution. I received the message from CFanatic Quote In Turbo C++, you can mark any line by #line LINE_NUMBER â€œFILE_NAMEâ€. You can get any line number just by click on that line and then you can write that line number in coding of C++ program. You can mark any line from any file just by using this code. Unquote I do not find any code for that.