[previous] 4463 [next] A constant expression of 'essentially signed' type (%1s) is being converted to narrower signed type, '%2s' on assignment.
Arithmetic type - Assignment

This message is issued whenever a constant expression of essentially signed type undergoes an assigning conversion to a narrower signed integer type. Note that the message will not be generated for a constant.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4463 --*/

void foo (signed char b);

signed char f4463 (void)
{
  signed char sca = (127 + 1); /* 4463 */

  foo (127 + 1);               /* 4463 */

  sca = (64 * 2);              /* 4463 */

  return (256 / 2);            /* 4463 */
}

For the purposes of QAC conversion messages, types are ordered according to the configured size (-s option), by default; hence for a typical 32 bit configuration, types int and long will be considered equivalent. However, when the -strictrank option is specified, types will be ordered according to their rank; consequently int will be considered narrower than long.

MISRA-C:2004 Rules applicable to message 4463:

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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