Quint64 initialisation without Q_UINT64_C

[marcus.fr]

Hi

I have a 64 bit integer initialized like this:
@quint64 myInt = 18446744073709550616;@

I get no compiler error (MSVC2010-32bit). However the documentation on this says:

--
typedef quint64
Literals of this type can be created using the Q_UINT64_C() macro:
quint64 value = Q_UINT64_C(932838457459459);

Even though I have no compiler error with regular initialization, I wonder if I should use Q_UINT64_C to make the code cross-platform safe? Ex:
@quint64 value = Q_UINT64_C(18446744073709550616);
quint64 value = Q_UINT64_C(0);@