1424			Enum object is being compared with an object of a different enum type using a relational operator.
	Arithmetic type - Enum types				REFERENCE - ISO:C90-6.5.2.2 Enumeration Specifiers

/*PRQA S 2017,2211,2213,3227,3408,3447,3602 ++*/

enum SIZE   { SMALL = 1, MEDIUM = 2, LARGE = 3 };
enum COLOUR { RED = 2, GREEN = 4, BLUE = 6 };

extern enum COLOUR shade;

extern void foo(enum SIZE box)
{
   if (box == shade) { }                /* Message 1420 */
   if (box != shade) { }                /* Message 1420 */

   if (box >  shade) { }                /* Message 1424 */
   if (box <= shade) { }                /* Message 1424 */

   return;
}

See also:

• 1420 Enum object is being compared with an object of a different enum type using an equality operator.