Results from VC++ (VS2015 Update 2): - 32-bit, demo 1: -268435456 - 32-bit, demo 2: 0 - 64-bit, demo 3: warning C4034: sizeof returns 0 error C2036:

Results from VC++ (VS2015 Update 2): - 32-bit, demo 1: -268435456 - 32-bit, demo 2: 0 - 64-bit, demo 3: warning C4034: sizeof returns 0 error C2036: 'arrayptr': unknown size