Line-Oriented Input

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14.2.3 Line-Oriented Input

To read from a file it must be opened for reading using fopen. Then a line can be read from the file using fgetl as the following code illustrates

     fid = fopen ("free.txt");
     txt = fgetl (fid)
          -| Free Software is needed for Free Science
     fclose (fid);

This of course assumes that the file free.txt exists and contains the line Free Software is needed for Free Science.

— Built-in Function: fgetl (fid, len)

Read characters from a file, stopping after a newline, or EOF, or len characters have been read. The characters read, excluding the possible trailing newline, are returned as a string.
If len is omitted, fgetl reads until the next newline character.
If there are no more characters to read, fgetl returns −1.
See also: fread, fscanf.

— Built-in Function: fgets (fid, len)

Read characters from a file, stopping after a newline, or EOF, or len characters have been read. The characters read, including the possible trailing newline, are returned as a string.
If len is omitted, fgets reads until the next newline character.
If there are no more characters to read, fgets returns −1.
See also: fputs, fopen, fread, fscanf.