Where does if gets its food?

Please clarify what you mean by "if". Do you mean:

* "If" as a conditional statement in programming? If so, it doesn't "eat" food, it's a part of the programming language and doesn't have physical needs.

* A specific animal or organism? If so, please tell me the name of the animal so I can help you find the answer.

For example, if you meant "a cat", I would say that cats get their food by hunting or being fed by humans.

Please provide more context so I can give you the correct answer.