[previous] 2104 [next] Integral promotion : signed char promoted to signed int.
Arithmetic type - Integral promotion REFERENCE - ISO:C90-6.2.1.1 Characters and Integers

An operand of type signed char is being converted to type signed int under the rules of integral promotion.

This type of conversion will occur whenever an expression of type signed char is used as an operand of the following operators:

Unary + - ~
Multiplicative * / %
Additive + -
Bitwise Shift << >>
Relational < > <= >=
Equality == !=
Bitwise & | ^
Conditional ? : (2nd and 3rd operands)

For example: 


/*PRQA S 3408,3447,3602,4130 ++*/

extern signed char sa;
extern signed char sb;
extern signed char sr;
extern signed int  si;

extern void foo(void)
{
    sr = sa + sb;                             /* Message 2104 */
    si = ~sr;                                 /* Message 2104 */
}

QA·C Source Code Analyser 8.1.2
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