Trailing Commas in Enumerations

When the C99 extensions setting is on, the compiler allows a comma after the final item in a list of enumerations. The following listing shows an example.

Listing: Trailing comma in enumeration example

enum
{
    violet,
    blue
    green,
    yellow,
    orange,
    red, /* OK: accepted if C99 extensions setting is on. */
};