overwriting a specific line on a text file?
c, file, file-writing, variables
Solution
This only works when the new line has the same size as the old one:
- Open the file in the mode `a+`
- `fseek()` to the start of the file
- Before reading the next line, use `ftell()` to note the start of the line
- Read the line
- If it's the line you want, `fseek()` again with the result from `ftell()` and use `fwrite()` to overwrite it.
If the length of the line changes, you must copy the file.
Problem
how do I go about overwriting a specific line on a text file in c?. I have values in multiple variables that need to be written onto the file.