Hashing - C / C++

snowteo

Hi,I have to do this exercises can you help me:
1)Write a program to implement exetendible hashing.If the table is small
enough to fin in main memory,how does its performance compare with open and
closed hasing?
2)A basic program consists of a series of statements,each of which is
numbered in ascending order.Control is passed by use of a goto or gosub and
a statement number.Write a program that reads in a legal BASIC program and
renumbers the statements so that the first starts at number f and each
statement has a number d higher than the previous statement.You may assume
an upper limit of n statements,but the statement numbers in the input might
be as large as a 32-bit integer.Your program must run in linear time.
Of it I have resolved many others,but these two I just do not succeed to
make them.Thank you very much

Jul 22 '05 #1

Subscribe Reply

3022

Karl Heinz Buchegger

snowteo wrote:

Hi,I have to do this exercises can you help me:
1)Write a program to implement exetendible hashing.If the table is small
enough to fin in main memory,how does its performance compare with open and
closed hasing?
2)A basic program consists of a series of statements,each of which is
numbered in ascending order.Control is passed by use of a goto or gosub and
a statement number.Write a program that reads in a legal BASIC program and
renumbers the statements so that the first starts at number f and each
statement has a number d higher than the previous statement.You may assume
an upper limit of n statements,but the statement numbers in the input might
be as large as a 32-bit integer.Your program must run in linear time.
Of it I have resolved many others,but these two I just do not succeed to
make them.Thank you very much

Could you be more specific.
What is your problem *exactly* ?

For the 1) do you know what is 'extendible hashing'.
same for 'open hashing', 'closed hashing'.

The whole problem seems to be to know the theory behind
these concepts. Once this theory is understood, an implementation
should be no problem

For 2)
read the file and create a table with 2 columns, the first
column holds the line number in the original 'program', the
second column holds the modified line number (you get this
modified line number by using the given arguments)

Do a second pass through the program and replace the
original line number with the modified line number. At the
same time analyze the statement. Is it a goto or gosub, then
take the target line number, look it up in the table and
replace it with the modified line number.

--
Karl Heinz Buchegger
kb******@gascad .at

Jul 22 '05 #2

Similar topics

2039

Hashing function

by: Pat | last post by:

I want to look for some one-to-one hashing function. In C++, any one-to-one hashing function?

C / C++

3448

Securing hashing algorithm

by: Wm. Scott Miller | last post by:

Hello all! We are building applications here and have hashing algorithms to secure secrets (e.g passwords) by producing one way hashes. Now, I've read alot and I've followed most of the advice that made sense. One comment I've seen alot about is "securing the hashing routine" but no-one explains how to accomplish this. So how do I secure my hashing routine? Do I use code access security, role based security, ACLs, etc or combination?...

C# / C Sharp

2886

hashing passwords

by: Dino M. Buljubasic | last post by:

Hi, I am using MD5 to hash my passwords and add them to database as hashed. I have noticed though that some passwords don't get recognized and I suppose that it happen because hashing might introduce some characters in my password that are not handled properly by SQL server then. For example, password 'startreck' works just fine password 'test' does not

Visual Basic .NET

3860

Hashing and comparing of arrays

by: Ole Nielsby | last post by:

How does the GetHashCode() of an array object behave? Does it combine the GetHashCode() of its elements, or does it create a sync block for the object? I want to use readonly arrays as dictionary keys, based on their content, not their identity. Is this feasible using the arrays directly, or do I need to wrap them in a struct that handles GetHashCode and Equal? If so, is such a wrapper present in the standard class library?

C# / C Sharp

4588

Simple hashing

by: Maya | last post by:

Hello all, I'm using MD5 hashing in my application to give unique values to huge list of items my application receives, originally every item's name was difficult to use as an id for this item although its unique but because it had certain characters and variable lengths I ended up using MD5 hashing of the name.

C# / C Sharp

2272

Hashing and Encryption

by: Jayender | last post by:

Hi, What is the difference between Hashing and Encryption ?

C# / C Sharp

3431

What hashing algorithm outputs numbers only?

by: wkatz | last post by:

Hi, Gurus. What hashing algorithm outputs hash value as numbers only? For example, if you pass a “John Q. Public” it will output 23324. If there is no such hashing, how hard is it to hire somebody to write a fairly quick one? It could be some fast hashing and then another function that creates numbers. Much obliged. wkatz.

C / C++

4433

Dynamic Hashing

by: Tinku | last post by:

Hi friends I know Static Hashing and i know about Dynamic Hashing, still i have problem to make program with Dynamic Hashing I am new in "C" world, please help me, my problem is: i have to make program in Dynamic hashing i have to store int value in nodes user only enter int value by this value i have to find hash key and make symbol table my struct are

C / C++

3027

STL Map uses hashing?

by: Vinodh | last post by:

I am reading about hashing techniques. The map data structure available in C++ STL uses hashing techniques?

C / C++

10921

Maximizing Business Potential: The Nexus of Website Design and Digital Marketing

by: jinu1996 | last post by:

In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...

Online Marketing

11055

The easy way to turn off automatic updates for Windows 10/11

by: Hystou | last post by:

Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...

Windows Server

9727

AI Job Threat for Devs

by: agi2029 | last post by:

Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...

Career Advice

8099

Access Europe - Using VBA to create a class based on a table - Wed 1 May

by: isladogs | last post by:

The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...

Microsoft Access / VBA

5939

Trying to create a lan-to-lan vpn between two differents networks

by: TSSRALBI | last post by:

Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...

Networking - Hardware / Configuration

6142

Windows Forms - .Net 8.0

by: adsilva | last post by:

A Windows Forms form does not have the event Unload, like VB6. What one acts like?

Visual Basic .NET

4776

transfer the data from one system to another through ip address

by: 6302768590 | last post by:

Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system

C# / C Sharp

4337

How to add payments to a PHP MySQL app.

by: muto222 | last post by:

How can i add a mobile payment intergratation into php mysql website.

PHP

3360

Comprehensive Guide to Website Development in Toronto: Expert Insights from BSMN Consultancy

by: bsmnconsultancy | last post by:

In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

General