[previous] 4446 [next] A non-constant expression of 'essentially unsigned' type (%1s) is being converted to signed type, '%2s' on assignment.
Arithmetic type - Assignment

This message is issued whenever a non-constant expression of essentially unsigned type undergoes an assigning conversion to a signed integer type.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4446 --*/

void foo (int b);

int f4446 (unsigned a)
{
  int sia = a;              /* 4446 */

  foo (a + 1u);             /* 4446 */

  sia = (a - 1u);           /* 4446 */

  return a;                 /* 4446 */
}

Note that message 4443 will be generated for safe (widening) conversions, instead.

MISRA C:2012 Rules applicable to message 4446:

Rule-10.3  (Required) The value of an expression shall not be assigned to an object with a narrower essential type or of a different essential type category.

See also:

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