Generally, laptops come with an adapter. Most adapters are suitable for both 110 and 230 V. Some might not be. It's not a property of the laptop anyway, but of the adapter.
If the original one doesn't, you certainly will be able to buy a third party one that does.
I am about to buy a Gateway NV 7915u Laptop. I divide my time between USA and Europe. Will this laptop work with Europe's 220 volt electric system. Thanks. Jason