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Arithmetic type - Balancing

The operands of this binary arithmetic operator are of different essential type categories; one is 'essentially signed' and the other is 'essentially unsigned'. Both essential types are of lower rank than type int but the result of the operation will be of type int because of integral promotion.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 1860 --*/

int f1860 (signed char a, unsigned char b)
{
  return a + b;                /* 1860 */
}

QA·C Source Code Analyser 8.1.2
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