QA·C Help - 0468

	0468	[C] Unary '-' requires arithmetic operand.

Constraint violations		REFERENCE - ISO:C90-6.3.3.3 Unary Arithmetic Operators - Constraints

This is a constraint error

Check the type of the operand. The operand of the unary operator '-' must be of arithmetic type. For example:


/*PRQA S 2017,2213,3198,3199,3203,3205,3408,3447 ++*/

struct ST { int x; };

extern struct ST field;
extern int *p;
extern int g;

void foo(void)
{
    int r;

    r = - field;                     /* Message 0468 and also 0557 */
    r = - p;                         /* Message 0468 and also 0557 */
    r = - g;                         /* OK           */

}

See also:

0557 [C] Right operand of assignment is not of arithmetic type.

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