Lots of extra commas were showing up in the first example for some reason.  It should read:

DECLARE @sStringVar VARCHAR(440) ,

 @lInteger Int ,

 @fFloat  decimal(6,2) ,

 @byUnsignedInt tinyint

SELECT @sStringVar = 'A string' ,

 @lInteger=44 ,

 @fFloat=3.14 ,

 @byUnsignedInt = 56

RAISERROR('The string variable contains %s, the int contains %d, the float contains %d, the uint contains %d',

 10 -- Informational severity only.

 ,1

 ,@sStringVar,

 @lInteger,

 @fFloat,

 @byUnsignedInt

) WITH LOG, NOWAIT