[previous] 4437 [next] A constant expression of 'essentially signed' type (%1s) is being converted to floating 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 floating type.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4437,1298 --*/

void foo (float b);

float f4437 (void)
{
  float fta = (1+1);        /* 4437 */

  foo (3 * 10);             /* 4437 */

  foo (0);                  /* 1298 */

  fta = (-1);               /* 4437 */

  return (+0);              /* 4437 */
}

Note that message 1298 will be generated for a constant instead.

MISRA-C:2004 Rules applicable to message 4437:

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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