[previous] 4447 [next] A 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 constant expression of essentially unsigned type undergoes an assigning conversion to a signed integer type.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4447,1291 --*/

void foo (int b);

int f4447 (void)
{
  int sia = (1u + 1u);      /* 4447 */

  foo (2u * 3u);            /* 4447 */

  foo (1u);                 /* 1291 */

  sia = (~0u);              /* 4447 */

  return (+0u);             /* 4447 */
}

Note that message 1291 will be generated for a constant instead.

MISRA-C:2004 Rules applicable to message 4447:

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

See also:

QA·C Source Code Analyser 8.1
MISRA-C:2004 Compliance Module 3.2
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