PL/SQL block doesn't set default values when passing null parameters to procedures

create table ANU_TEST1

(

  SOURCE1 INTEGER default 1 not null,

  SOURCE2 INTEGER default 0 not null,

  SOURCE3 INTEGER default -1 not null

)

 

 

 

Create or replace procedure anu_test(

 a integer default 1,

 b integer default 0,

 c integer default -1)

 as

Begin

 

INSERT INTO anu_test1 values(a,b,c);

end;

when passing no values to procedure, it should insert a row with 1,0 and -1 to table anu_test1 but it's giving error saying can't insert null. I debug the procedure and found that a,b and c comes with as null value from procedure.

Please let me know where is wrong happening?

Thanks,