c - overwriting a specific line on a text file? -

How do I write a specific file on a specific line in C.? I have values ​​in many variables that need to be written on the file.

This works only when the size of the new line is the same:

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Open the file in a +

fseek () to start the file

Next line Before reading, use ftell () to keep the beginning of the line in mind

Read the line

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If you want to Line, then use ftell () and fwrite () with the result from fseek () overwrite it

If line length changes, then you should make a copy of the file.