Mutual recursion, PL-SQL Programming

Assignment Help:

Mutual Recursion

The Subprograms are mutually recursive if they directly or indirectly call each other. In the illustration below, the Boolean functions odd & even, that determine whether the number is odd or even, call each other straightly. The forward declaration of odd is essential as even calls odd, that is not yet declared when the call is made.

FUNCTION odd (n NATURAL) RETURN BOOLEAN; -- forward declaration

FUNCTION even (n NATURAL) RETURN BOOLEAN IS

BEGIN

IF n = 0 THEN

RETURN TRUE;

ELSE

RETURN odd(n - 1); -- mutually recursive call

END IF;

END even;

FUNCTION odd (n NATURAL) RETURN BOOLEAN IS

BEGIN

IF n = 0 THEN

RETURN FALSE;

ELSE

RETURN even(n - 1); -- mutually recursive call

END IF;

END odd;

When the positive integer n is agreed to odd or even, the functions call each other by turns. At each call, the n is decremented. Eventually, n becomes zero and the final call returns TRUE or FALSE. For illustration, passing the number 4 to odd outcome in this series of calls:

odd(4)

even(3)

odd(2)

even(1)

odd(0) -- returns FALSE

On the other hand, passing the number 4 to even outcome in this series of calls:

even(4)

odd(3)

even(2)

odd(1)

even(0) -- returns TRUE


Related Discussions:- Mutual recursion

Fetching across commits, Fetching Across Commits The FOR UPDATE clause...

Fetching Across Commits The FOR UPDATE clauses acquire exclusive all row locks. All rows are locked when you open the cursor, and when you commit your transaction they are unl

Mutual recursion, Mutual Recursion The Subprograms are mutually recursi...

Mutual Recursion The Subprograms are mutually recursive if they directly or indirectly call each other. In the illustration below, the Boolean functions odd & even, that dete

Using set transaction, Using SET TRANSACTION You use the SET TRANSACTI...

Using SET TRANSACTION You use the SET TRANSACTION statement to begin the read-only or read-write transaction, start an isolation level, or assign your present transaction to a

Differentiate between snowflake schema and star schema, Problem: (a) De...

Problem: (a) Define the following terms: (i) data mining. (ii) OLAP. (b) Differentiate between snowflake schema and star schema. Support your answer with appropriate

Create a procedure that update the status, Create a procedure named STATUS_...

Create a procedure named STATUS_SHIP_SP that allows a company to employee in the Shipping Department to update the status of an order to add shipping information. The BB_BASKETSTAT

Using invoker rights in pl sql, Using Invoker Rights: By default, the ...

Using Invoker Rights: By default, the stored procedure executes with the privileges of its definer, not its invoker. These procedures are bound to the schema in which they inh

Pl sql code to declare cursors with parameter, Write a pl/sql block that de...

Write a pl/sql block that declares and uses cursors with parameters. In a loop, use a cursor to retrieve the department number and the department name from the departments table

Merge two data sources to sql azure database, Project Description: I hav...

Project Description: I have two types of data sources. One that is a list in SharePoint and another that is an access desktop database. The access desktop database is fairly com

Program, heap sort program in pl/sql

heap sort program in pl/sql

I need sql to infopath data connection, I need SQL to infopath data connect...

I need SQL to infopath data connection Project Description: Want data retrieval connection from SQL to SharePoint infopath Skills required are Sharepoint, SQL

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd