[previous] 4543 [next] A non-negative constant expression of 'essentially signed' type (%1s) is being used as the left-hand operand of this shift operator (%2s).
Arithmetic type - Operands

This message is issued whenever a constant expression of essentially signed type with a non-negative value appears on the left hand side of a shift operator.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4543 --*/

void f4543 (unsigned a)
{
  1 << a;                   /* 4543 */
  
  2 >> a;                   /* 4543 */
}

QA·C Source Code Analyser 8.1.2
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