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Arithmetic type - Operands REFERENCE - ISO:C90-6.3.3.3 Unary Arithmetic Operators

The operand of this logical negation operator (!) is derived from a bitwise or arithmetic operator. This is probably a mistake; perhaps a bitwise AND (&) or bitwise OR (|) was intended ?

For example: 


/*PRQA S 2017,3198,3199,3203,3227,3408 ++*/

extern void foo(unsigned int a, unsigned int b)
{
    int r;

    r = !(a || b);                    /* OK */

    r = !(a | b);                     /* Message 4110 */

}

MISRA-C:2004 Rules applicable to message 4110:

Rule  12.6  (Advisory) The operands of logical operators (&&, || and !) should be effectively Boolean. Expressions that are effectively Boolean should not be used as operands to operators other than (&&, ||, !, =, ==, != and ?:).

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