Why do we need function if values can be retrieved from the procedures

My question is why do we need functions in Oracle when I cen retrieve the values from procedures using in out arguments ?? Anyone any comments ...

Languages usually provide more than one way of doing the same thing. This encourages different styles of coding.
I have found functions returning Boolean values useful in telling me whether the functionality in the code encapsulated in a function has worked successfully or not, in addition to returning OUT parameters that I need to use in the rest of the program. This way I can include the call to the function in IF ... Then ... end if; logic. By using this contstruct the code reads logically and is able to document the flow of control also. It helps in "killing two birds with one stone".
As one becomes more adept at using a language, one appreciates the facility of doing something more than one way, to suit one's style, I guess ...
Narayan.
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