QA·C Help - 3391

	3391	Extra parentheses recommended. A conditional operation is the operand of another conditional operator.

Readability

The order in which operators are processed in this expression is not sufficiently clear and so additional parentheses are recommended. In the absence of parentheses, the sequence is determined by rules of precedence and associativity.

In this expression, there are 2 conditional operators and the order in which they are evaluated may not be obvious. In fact, the second operator (the right hand one) is evaluated first. Add parentheses around this operator and its operands to make it clear which operator is evaluated first.

For example:


/*PRQA S 2017,3198,3199,3203,3344,3401,3408,3447 ++*/

extern int a;
extern int b;
extern int c;
extern int d;
extern int e;

extern void foo(void)
{
    int r;

    r = a ? b : c ? d : e;        /* Message 3391 + 3390 */
    r = a ? b : (c ? d : e);      /* OK                  */

    r = a ? b ? c : d : e;        /* Message 3391 + 3390 */
    r = a ? (b ? c : d) : e;      /* OK                  */

}

See also:

3389 Extra parentheses recommended to clarify the ordering of a % operator and another arithmetic operator (* / % + -).
3392 Extra parentheses recommended. A shift, relational or equality operation is the operand of a second identical operator.
3393 Extra parentheses recommended. An arithmetic operation (* / + -) is the operand of a different operator with the same precedence.
3394 Extra parentheses recommended. A shift, relational or equality operation is the operand of a different operator with the same precedence.
3395 Extra parentheses recommended. A * or / operation is the operand of a + or - operator.
3396 Extra parentheses recommended. A binary operation is the operand of a conditional operator.
3397 Extra parentheses recommended. A binary operation is the operand of a binary operator with different precedence.

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