How to call multiple procedure within a single function ? Please help!

create or replace function fn_dml_oprs
return number
as
procedure prc_insert
as
pragma autonomous_transaction;
begin
insert into t1 values(250) where A=20;
commit;
end;
procedure prc_update
as
pragma autonomous_transaction;
begin
update t1 set A=300 where A=10;
commit;
end;
procedure prc_delete
as
pragma autonomous_transaction;
begin
delete from t1 where A=30;
commit;
end;
begin
prc_insert;
prc_update;
prc_delete;
return 0;
end;
/