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##### Showing C Function Headings

To show in which functions differences occur for C and similar languages, you can use the `-p` or `--show-c-function` option. This option automatically defaults to the context output format (see Context Format), with the default number of lines of context. You can override that number with `-C lines` elsewhere in the command line. You can override both the format and the number with `-U lines` elsewhere in the command line.

The `-p` and `--show-c-function` options are equivalent to `-F '^[[:alpha:]$_]'` if the unified format is specified, otherwise `-c -F '^[[:alpha:]$_]'` (see Specified Headings). GNU `diff` provides them for the sake of convenience.