QA·C Help - 3917

	3917	unsigned char value returned from long %s().

Arithmetic type - Implicit conversions

An expression of type unsigned char is being implicitly converted to type signed long. This is not dangerous unless the two types happen to be implemented in the same number of bits. However implicit type conversions from an unsigned type to a signed type are not recommended.

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(signed long f);

extern signed long foo(unsigned char n)
{
    signed long f = n;          /* Message 3717 - Initialization */

    f = n;                      /* Message 3717 - Assignment */

    ef(n);                      /* Message 3717 - Function argument */

    return n;                   /* Message 3917 - Function return */
}