Delete a single line from a file

You can achieve this by following the steps below.

* Get the line number that needs to be deleted.

* Open the input file in Read Mode

* Open a temp file in write / append mode and set the counter variable to 0

* Read Contents from input file line by line Increment the counter by 1

* If the counter is matching with input line number then skip the line from writing into the output file.

* Continue untill end of file.

* Close both files.

* Remove the original file and move the temp file to original file.


This is the traditional way of doing what you want :)

BR//
Harsha

You should read the file line by line (you may use getline[^] for the purpose), and save read lines to a memory buffer, for instance a vector of string (or to another, temporary, file), skipping the 'to be deleted' line. Finally overwrite the existing file with the memory buffer content (or with the temporary file content).

One could also consider doing an in-place copy of the contents after the deleted line. Requires a little more logic, but can be significantly faster.