Output Parameter Not Returned

Why does this script return a pair of nulls? I'm using SQL Server 2008, script run in MSSMS.

CREATE PROCEDURE proc_Test
    (
    @Input int,
    @Out1 int OUTPUT,
    @Out2 varchar(10) OUTPUT
    )

AS

BEGIN
    SET NOCOUNT OFF
    SET @Out1 = 100 + @Input
    SET @Out2 = 'result=开发者_StackOverflow' + CONVERT(varchar,@Out1)
    RETURN

END

GO

DECLARE @Out1 int, @Out2 varchar(10)
exec proc_Test  @Input=1, @Out1=@Out1, @Out2=@Out2
select @Out1, @Out2

---

You need to specify vars as output:

DECLARE @Out1 int, @Out2 varchar(10) 
exec proc_Test @Input = 1, @Out1 = @Out1 output, @Out2 = @Out2 output
select @Out1, @Out2 

As a small matter of style try not to name the vars that receive the results the same as the parameter variables; it gets too confusing.