QA·C Help - 3923

	3923	signed char value returned from unsigned char %s().

Arithmetic type - Implicit conversions

An expression of type signed char is being implicitly converted to type unsigned char. A conversion of this type is dangerous; the result of converting any negative value will probably be meaningless.

Implicit type conversions of this nature can occur in the context of:

initializations
assignment operations
the passing of a function argument
the return of a value from a function


/*PRQA S 2017,3197,3199,3203,3227,3408,3447,3602,3625 ++*/

extern void ef(unsigned char up);

extern unsigned char foo(signed char s)
{
    unsigned char u = s;        /* Message 3723 - Initialization */

    u = s;                      /* Message 3723 - Assignment */

    ef(s);                      /* Message 3723 - Function argument */

    return s;                   /* Message 3923 - Function return */
}