[previous] 0468 [next] [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           */

}

MISRA-C:2004 Rules applicable to message 0468:

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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