QA·C Help - 4559

	4559	An expression of 'essentially unsigned' 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 unsigned type has been used as the first operand of the conditional operator.

For example:


/*PRQA S 1-9999 ++*/
/*PRQA S 4559 --*/

int f4559 (unsigned a)
{
  return a ? 0 : 1;         /* 4559 */
}

MISRA-C:2004 Rules applicable to message 4559:

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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