0513			[C] Relational operator used to compare pointers to incompatible types.
	Constraint violations				REFERENCE - ISO:C90-6.3.8 Relational Operators - Constraints

• Both operands are of arithmetic type, or
• Both operands are pointers to qualified or unqualified versions of compatible object types, or
• Both operands are pointers to qualified or unqualified versions of compatible incomplete types

/*PRQA S 490,3408,3447,3602,3625,3684 ++*/

extern int        *pi;
extern char       *pc1;
extern const char *pc2;
extern int         buf1[];
extern float       buf2[];

void foo(void)
{
    if (pi < pc1)            /* Message 0513 */
    {
    }

    if (buf1 > buf2)         /* Message 0513 */
    {
    }

    if (pc1 < pc2)           /* OK           */
    {
    }
}

See also:

• 0514 [C] Relational operator used to compare a pointer with an incompatible operand.
• 0515 [C] Equality operator used to compare a pointer with an incompatible operand.