plsql three cycles

set serveroutput on

declare
pnum number :=1 ;

begin

while pnum<=10 loop
dbms_output.put_line(pnum);
pnum :=pnum+1;

end loop;

end;
/



set serveroutput on

declare
pnum number :=1 ;

begin
loop
exit when pnum>10;
dbms_output.put_line(pnum);
pnum :=pnum+1;
end loop;

end;
/






set serveroutput on

declare
pnum number :=1 ;

begin
 for pnum in 1..10 loop
dbms_output.put_line(pnum);

end loop;

end;
/