Appending text information to a text file at a certain spot without overwriting old information (C)

Question

So I have a txt file that looks like this:

112 12.50 Y 15

267 7.75 N 20

382 15.50 N 45

User is prompted where he wants to insert

Answer 1

The only option that you have to add information in the middle of a file without overwriting old data is to move manually all the data following the position where you want to add into the file.