[previous] 4401 [next] An expression of 'essentially Boolean' type (%1s) is being converted to character type, '%2s' on assignment.
Arithmetic type - Assignment

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

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4401 --*/

void foo (char b);

char f4401 (int a)
{
  char pca = (a != 0);      /* 4401 */

  foo (a < 0);              /* 4401 */

  pca = (a < 0);            /* 4401 */

  return (a == 0);          /* 4401 */
}

MISRA-C:2004 Rules applicable to message 4401:

Rule  6.1  (Required) The plain char type shall be used only for the storage and use of character values.
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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