QA·C Help - 0542

	0542	[C] Controlling expression must have scalar (arithmetic or pointer) type.

Constraint violations		REFERENCE - ISO:C90-6.6.4.1 The if Statement - Constraints, ISO:C90-6.6.5 Iteration Statements - Constraints

This is a constraint error

The controlling expression of this if, while, do while or for statement is not of scalar type. An expression of void, struct, union or array type is not permitted. For example:


/*PRQA S 2213,2216,3408,3416,3447 ++*/

struct ST {int a; int b;};

extern struct ST stx;

void bar(void);

void foo(void)
{
    if (stx)     /* Message 0542 and also 3344          */
    {
    }

    if (bar())   /* Message 0542 and also 0543 and 3344 */
    {
    }
}

See also:

0543 [U] 'void' expressions have no value and may not be used in expressions.
3344 Controlling expression is not an 'essentially Boolean' expression.

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