QA·C Help - 4047

	4047	long value returned from unsigned long long %s().

Arithmetic type - Implicit conversions

An expression of type signed long is being implicitly converted to type unsigned long long. 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 ++*/
/****************************
 * OPTIONS: -ex LONGLONG
 ****************************/


extern void ef(unsigned long long up);

extern unsigned long long foo(signed long s)
{
    unsigned long long u = s;   /* Message 3847 - Initialization */

    u = s;                      /* Message 3847 - Assignment */

    ef(s);                      /* Message 3847 - Function argument */

    return s;                   /* Message 4047 - Function return */
}

No MISRA C:2012 Rules applicable to message 4047

See also:

3847 Implicit conversion: long to unsigned long long.

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