Sum of two no. using procedure in pl/sql

set serveroutput on;
declare
a int;
c int;
b int;

procedure pie(x IN number, y in number ,Z in out number)
is
begin
z:=x+y;
end;



begin
pie(5,6,a);
dbms_output.put_line('hello '||a);
end;

LOCAL PROCEDURE in PL/SQL

set serveroutput on;
declare
a int;
c int;
b int;

procedure pie(x in out number)
is
begin
x:=x+10;


end;

begin
a:=5;
pie(a);

dbms_output.put_line('hello '||a);
end;

IMPLICIT Cursor in PL/SQL

set serveroutput on;
declare
idc number(2);

begin

update e1111 set id=id+500;


if sql%notfound then
dbms_output.put_line('not found');

ELSIF sql%found THEN
      idc := sql%rowcount;
      dbms_output.put_line( idc || ' customers selected ');
   END IF;
END;

PL/SQL While Loop

set serveroutput on;
set verify off;
declare
i int:=1;
j int;
begin
WHILE i<10 loop
dbms_output.put_line(i);
i:=i+1;

end loop;

end;

output :

1 
2 
3 
4 
5 
6 
7 
8 
9