C Write To Files

Writing files is done with the function fprintf (writing formatted text) or fputs after the file is opened with "w" or "a" mode. The "w" mode creates a new file or overlaps the entire contents of an existing file, while the "a" adds text at the end of the file. Always check the results of fclose or write operations to make sure the data is actually stored. After writing, the file must be closed so that the empty buffer is written to the disk.