QA·C Help - 0543

	0543	[U] 'void' expressions have no value and may not be used in expressions.

Explicitly undefined		REFERENCE - ISO:C90-6.2.2.2 void

An attempt has been made to used the value of an expression which is of type void. This is meaningless and the result will be undefined.

In practice, any attempt to use the value of a void expression is likely to result in other messages. For example, in the code below, message 0481 (a constraint error) is also generated.


/*PRQA S 2017,3199,3203,3408,3447 ++*/

extern void func(void);


extern void foo(void)
{
    int r;

    r = (int)func();                    /* Message 0543 - and also 0481 */
}

See also:

0481 [C] Only scalar expressions may be cast to other types.

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