[previous] 2101 [next] Integral promotion : unsigned short promoted to signed int.
Arithmetic type - Integral promotion REFERENCE - ISO:C90-6.2.1.1 Characters and Integers

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

This type of conversion will occur if type short is smaller than type int and an expression of type short 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 ++*/

extern unsigned short ua;
extern unsigned short ub;
extern unsigned short ur;
extern signed int     si;

extern void foo(void)
{
    ur = ua + ub;                             /* Message 2101 */
    si = ~ur;                                 /* Message 2101 */
}

See also:

QA·C Source Code Analyser 8.1.2
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