[previous] 0558 [next] [C] Right operand of '+=' or '-=' must have integral type when left operand is a pointer.
Constraint violations REFERENCE - ISO:C90-6.3.16.2 Compound Assignment - Constraints

This is a constraint error

If the left hand operand of a += or -= operator is a pointer, the right hand operand must be of integral type. For example: 


/*PRQA S 488,510,3120,3227,3408,3447 ++*/

extern float ft;
extern int * pi;
extern int * pj;

void foo(float dec)
{
    ft += dec;                /* OK */
    pi += 2;                  /* OK */
    pi += dec;                /* Message 0558 */
    pi += pj;                 /* Message 0558 */

    ft -= dec;                /* OK */
    pi -= 2;                  /* OK */
    pi -= dec;                /* Message 0558 */
    pi -= pj;                 /* Message 0558 */
}

MISRA-C:2004 Rules applicable to message 0558:

Rule  1.1  (Required) All code shall conform to ISO/IEC 9899:1990 C programming language, ISO 9899, amended and corrected by ISO/IEC 9899/COR1:1995, ISO/IEC 9899/AMD1:1995, and ISO/IEC 9899/COR2: 1996192

See also:

QA·C Source Code Analyser 8.1
MISRA-C:2004 Compliance Module 3.2
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