[previous] 1823 [next] The %1s operand is non-constant and 'essentially signed' (%2s) but will be implicitly converted to an unsigned type (%3s) in this equality operation.
Arithmetic type - Balancing

This message is issued whenever a non-constant expression of essentially signed type has been used as an operand of an equality operator, and undergoes a usual arithmetic conversion to an unsigned integer type (the type of the other operand).

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 1823 --*/

void f1823 (int a, unsigned b)
{
  if (b == a)                /* 1823 */
  {
  }

  if ((a - 1) != b)          /* 1823 */
  {
  }
}

MISRA-C:2004 Rules applicable to message 1823:

Rule  10.1  (Required) The value of an expression of integer type shall not be implicitly converted to a different underlying type if: a) it is not a conversion to a wider integer type of the same signedness, or b) the expression is complex, or c) the expression is not constant and is a function argument, or d) the expression is not constant and is a return expression

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