[previous] 4548 [next] A non-negative constant expression of 'essentially signed' type (%1s) is being used as the %2s operand of this logical operator (%3s).
Arithmetic type - Operands

This message is issued whenever a constant expression of essentially signed type with a non-negative value has been used as an operand of a logical operator.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4548 --*/

void f4548 (_Bool a)
{
  if (1 && a)               /* 4548 */
  {
  }
  
  if (a || !1)              /* 4548 */
  {
  }
}

MISRA-C:2004 Rules applicable to message 4548:

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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