Can't declare variable in function MS SQL

Question

I'm newbie in SQL and trying to create function in MS SQL 2008R2, but can't declare variable inside function. What's wrong with this code?

CREATE FUNCTION denominator() RETURNS int
BEGIN
    DECLARE @Count;
    -- Some logic here
END;

GO
SELECT dbo.denominator()

DROP FUNCTION denominator

I'm getting that kind of errors:

Msg 102, Level 15, State 1, Procedure denominator, Line 3
Incorrect syntax near ';'.
Msg 4121, Level 16, State 1, Line 1
Cannot find either column "dbo" or the user-defined function or aggregate "dbo.denominator", or the name is ambiguous.

Answer 1

you need to write like this , data type of variable is missing

DECLARE @Count int;

Answer 2

you're declaring of @Count has no data type, you should provide it.

DECLARE @Count int