[previous] 1812 [next] An operand of 'essentially character' type is being subtracted from an operand of 'essentially unsigned' type.
Arithmetic type - Balancing

This message is issued whenever an expression of essentially character type is subtracted from an expression of essentially unsigned type.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 1812 --*/

unsigned f1812 (unsigned a, char b)
{
  b = b - a;                /* OK, essential type of RHS is char */
  return a - b;             /* 1812 */
}

QA·C Source Code Analyser 8.1.2
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