[previous] 1840 [next] The %1s operand is constant, 'essentially signed' (%2s) and non-negative but will be implicitly converted to an unsigned type (%3s) in this arithmetic operation.
Arithmetic type - Balancing

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 binary arithmetic 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 1840 --*/

unsigned f1840 (unsigned b)
{
  b = b + 1;                /* 1840 */

  return ((2 - 1) + b);     /* 1840 */
}

MISRA C:2012 Rules applicable to message 1840:

Rule-10.4  (Required) Both operands of an operator in which the usual arithmetic conversions are performed shall have the same essential type category

QA·C Source Code Analyser 8.1
MISRA C:2012 Compliance Module 1.0
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