Will a 64-bit Unsigned Integer wrap around on 32-bit system?

Question

Simple question, need an answer quickly please!

Take this situation on a 32-bit machine:

Unsigned long long n = 1;
n -= 2;

I know on a 64-bit machine, this would wrap around to the highest unsigned long long. But what would happen on a 32-bit machine, since the long long is stored as two separate words?

Thank you!

score 1 · Accepted Answer · answered Oct 29 '12 at 06:36

1

If the implementation is conforming, then the same: it will correctly wrap around. I assume this is C; The C standard requires this behavior independently from the implementation details.

answered Oct 29 '12 at 06:36

score 1 · Answer 2 · answered Oct 29 '12 at 06:37

1

A 64 bit integer datatype behaves the same on all architectures, including 32 bit. If not, programming would be quite hard, wouldn't it?

answered Oct 29 '12 at 06:37

Lindydancer

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Will a 64-bit Unsigned Integer wrap around on 32-bit system?

2 Answers2