The example given below shows a While Loop. Here the value of the variable I is checked to ascertain whether it is less than 10 and as long as it is so the body of the loop will be executed.
DECLARE
I NUMBER (4) :=0;
BEGIN
WHILE (I<10)
LOOP
I:= I+1;
DBMS_OUTPUT.PUT_LINE (I);
END LOOP;
END;