Consider the following code snippet: what will be the output?DECLAREa number(2) ;BEGINFOR a IN REVERSE 10 .. 20 LOOPEND LOOP;dbms_output.put_line(a);END;
Question
Consider the following code snippet: what will be the output?
DECLARE
a number(2);
BEGIN
FOR a IN REVERSE 10 .. 20 LOOP
END LOOP;
dbms_output.put_line(a);
END;
Solution
The code you've provided seems to be written in PL/SQL, Oracle's procedural language. However, there are a few issues with it.
Firstly, the DECLARE
keyword is used to start a PL/SQL block, but it's not followed by any variable declaration.
Secondly, the a number(2);
line is incorrect. If you're trying to declare a variable a
of type number
, it should be a NUMBER(2);
(note the capitalization).
Thirdly, the FOR a IN REVERSE 10 .. 20 LOOP
line is incorrect. The REVERSE
keyword is not valid in this context. If you want to loop from 20 to 10, you should use FOR a IN 20..10 LOOP
.
Finally, the dbms_output.put_line(a);
line is outside the loop, so it will not print the value of a
for each iteration. It will only print the value of a
after the loop has finished.
Here's a corrected version of your code:
DECLARE
a NUMBER;
BEGIN
FOR a IN REVERSE 20..10 LOOP
dbms_output.put_line(a);
END LOOP;
END;
This will print the numbers from 20 to 10 in descending order. However, please note that the REVERSE
keyword is not supported in all versions of Oracle. If it's not supported in your version, you can use a WHILE
loop instead.
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