Procedure - how get the output value in sql+

I am new to Oracle and its PL/SQL.
How can I get the output value of a procedure in sqlplus? Example:
create or replace procedure p_newid (oldid IN number, newid out number ) is
  wn number;
begin

    select ..... into wn;
    newid := wn;
end;
/

When executing in sql+
  exec p_newid(1); I get

ERROR at line 1:
ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to 'P_NEWID'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

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Before you buy. Received on Tue Apr 18 2000 - 00:00:00 CDT