QA·C Help - 0556

	0556	[C] Left operand of assignment must be a modifiable object.

Constraint violations		REFERENCE - ISO:C90-6.3.16 Assignment Operators - Constraints

This is a constraint error

An attempt is being made to assign to an object which is not a modifiable lvalue. For example:


/*PRQA S 3132,3227,3313,3408,3447,3602,3617 ++*/

extern struct ST stx;       /* ST is incomplete type */
extern struct ST sty;

extern int lbuf[10];
extern const int ci;

void foo(int mode)
{
    lbuf = mode;            /* Message 0556 and also 0555 */
    ci = mode;              /* Message 0556               */
    stx = sty;              /* Message 0556 and also 0545 */
}

MISRA C:2012 Rules applicable to message 0556:

Rule-1.1 (Required)

The program shall contain no violations of the standard C syntax and constraints, and shall not exceed the implementation's translation limits

See also:

0545 [U] The value of an incomplete 'struct' may not be used.
0555 [C] Invalid assignment to object of void type or array type.

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MISRA C:2012 Compliance Module 1.0
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