oracle function

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C#

Oracle

Oracle function not returning boolean
If not why able to create?

  create or replace function mostaaafa return
   boolean is
     Result boolean;
     n number(4):=0;
   begin
  if n = 0 then
     result:=true;
  else
   result:=false;
  end if;
     return result;
*  end ;
SQL> /

Function created.
// so if created how I can call form C#?