TIOBE - C Coding Standard

SR: 9.4.2#1

Synopsis:	All switch statements shall have a default clause, even if that clause is empty.
Language:	C
Severity Level:	3
Category:	STATEMENTS

Description:

Defensive programming dictates that multiple choice constructs have a guard condition, to trap "impossible" errors.

Example:

switch( a )
{
    case 'a':
    case 'b':
        break;
    case 'c':
        j = 4;
    case 'd':
} /* WRONG - no default clause */

Example:

switch( a )
{
    case 'a':
    case 'b':
        break;
    case 'c':
        j = 4;
    case 'd':
    default:
        ;
} /* RIGHT - default case */