Need to show results from either 1st OR 2nd cell

Hopefully this is an easy one for people here, however i have been close to throwing my laptop around the room...

I am trying to enter a formula where the cell shows the results from either two other cells.

For example...

There will be values in either A1 or B1. There will never be values in both.

I want C1 to show either A1 or B1 depending on which has a value in it....

I thank you in advance for your help.

(the spreadsheet i am working on is much more complex than the example above, however I should be able to convert any answers to suit my needs)