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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;
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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.

This problem has been solved

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