[previous] 4539 [next] An expression of 'essentially signed' type (%1s) is being used as the first operand of this conditional operator (%2s).
Arithmetic type - Operands

This message is issued whenever an expression of essentially signed type has been used as the first operand of the conditional operator.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4539 --*/

int f4539 (int a)
{
  return a ? 0 : 1;         /* 4539 */
}

MISRA-C:2004 Rules applicable to message 4539:

Rule  13.2  (Advisory) Tests of a value against zero should be made explicit, unless the operand is effectively Boolean.

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