[previous] 4440 [next] An expression of 'essentially unsigned' type (%1s) is being converted to Boolean type, '%2s' on assignment.
Arithmetic type - Assignment

This message is issued whenever an expression of essentially unsigned type undergoes an assigning conversion to Boolean type.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4440 --*/

void foo (_Bool b);

_Bool f4440 (unsigned short a)
{
  _Bool boa = a;            /* 4440 */

  foo (a + 1u);             /* 4440 */

  boa = a - 1u;             /* 4440 */

  return a;                 /* 4440 */
}

MISRA-C:2004 Rules applicable to message 4440:

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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