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The string class in C++

graemew — Tue, 26 May 2009 21:20:49 +0000

In C++ a string is implemented as an instance of the string class. Inorder to use the functions of this class, the following include statement must be part of your program code:

#include

As the string class is a member of the namespace std , an instance of this class is declared with the following syntax:

std::string messageStr; // declares a string called messageStr

Remember, the std:: syntax can be omitted, provided you include the following statement in your code:

using namespace std;

The members of the string class are:

Parameters:

str a string [(data type: string]

pos a (character) position in the string [ data type: type_t ]

no the number of characters selected [ data type: type_t ]

Commonly used methods in the string class, include:

length() returns the number of characters in the stored string

capacity() returns the capacity of the string; this is greater than or equal to the length of the string

[i] returns the ith character of the string

insert( pos, str ) inserts the string st, starting at the position pos in the string

remove( pos, no ) starting at position pos in the string, removes the number of characters no

get_at( pos ) returns the character at position pos in the string

put_at( pos, char ) replaces the character at position pos, with the character char

replace( pos, no, str ) starting at position pos, replaces number of characters no, with the string str

+ returns the concatenation of two strings, eg john + smith would be johnsmith

substr( pos, no ) returns a new string that begins with the character at position pos in the original string, and has length no (remember: no = number of characters)

Strings in C++

admin — Tue, 26 May 2009 20:38:01 +0000

Strings and Arrays of characters in C++

Low level strings are represented by arrays of characters in C and C++. These arrays are terminated by ‘\0′ , the special marker character null, which is used to indicate the end of a string.

char string1[ ] = { ‘H’,'e’,'l’,'l’,'o’,’ ‘, ‘W’, ‘o’, ‘r’, ‘l’, ‘d’, ‘\0′ }

The following short program could be used to display string1 :

#include

using namespace std;

int main() {

char string1[ ] = { ‘H’,'e’,'l’,'l’,'o’,’ ‘, ‘W’, ‘o’, ‘r’, ‘l’, ‘d’, ‘\0′ } ;

cout << string1 << endl ;

return 0;

}

Using Enumerations in C++

admin — Sun, 24 May 2009 20:41:36 +0000

Enumerations in C++ work in a similar manner to other languages, to restrict a particular variable to having a specific set of values.

For example:

enum Names {Fred, Mary, John, Anne}

In this case, a new type is created, which may have only the values Fred, Mary, John, Anne.

The compiler will represent Fred as 0, Mary as 1 and so on. John will take the next value, which here will be 2.

Learning Cplusplus

admin — Wed, 06 Jun 2007 05:06:03 +0000

Learning C++

admin — Tue, 05 Jun 2007 05:45:47 +0000

Youtube Results For Learning C++
C++ – 01 – Introduction to C++

1.85 min. | 4.428571 user rating

This video introduces you to C++. A high resolution video and a text version of this tutorial is available at: www.programmingvideotutorials.com Some relevant keywords: C++ visual studio c++ how to learn C++ simple concise c++ screencast beginner c++ free windows program software application development c++ basic languages computer

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Question Learning C!?
Hi! At present i dont know about C language. I want to learn it. Can you tell me a name of a very good, a clearly understandable book, website addresses for learning C clearly. I want to develop my logic.
I hope many will give many different addresses & names of books.
Please help me.
Thanks in advance!

The Best Answer I like thinking inc and thinking in C++ by Bruce Eckel

http://www.digilife.be/quickreferences/Books/Thinking%20in%20C++,%20Volume%202,%202nd%20Edition.pdf

Good Luck;)

Learn Cplusplus

admin — Mon, 04 Jun 2007 06:50:23 +0000

Youtube Results For Learn Cplusplus
Let’s Learn C++: Lesson 5: If Statements

9.48 min. | 5.0 user rating

In this lesson, I will teach you about if statements and how they can make your program more diverse. After this lesson, you should be able to make programs that accept conditions and follow different paths depending on the value of variables. This lesson was written by Hawkpath. My friend who is helping me with these tutorials. Look for the text version of this lesson on: letslearncpp.forumstech.com If you have any questions, email me at: letslearncpp@gmail.com

Learn C++

admin — Sun, 03 Jun 2007 06:55:06 +0000

Youtube Results For Learn C++
C++ Tutorial for Beginners

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www.krashcourse.com A step by step introductory C++ tutorial designed especially for visual learners. Download complete tutorial at www.krashcourse.com (Actual tutorial is a PDF file and does not include sound.) Download the new Visual Studio C++ 2010 or older 2008 version here: www.microsoft.com

Yahoo Answers For Learn C++

Question Learn C++ ???
Where can I learn C++ online? I have tried wikibooks but that has a lot of missing stuff.
Is there any comprehensive guides that are quite easy to follow?

The Best Answer http://www.cplusplus.com/doc/tutorial/

This (IMO) is a fairly good website, if it seems incomplete or there seems to be something missing you can always post here to see if someone can fill you in on that.

Also, since I’m a big fan of wikipedia, I’d recommend the wikiversity tutorial on C++

http://en.wikiversity.org/wiki/C%2B%2B

If these aren’t any good, I’ll try to look for some other ones.

Has also on wikibooks, they have sections where people don’t add information. Every now and again there is a to do box.

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admin — Sat, 02 Jun 2007 05:50:53 +0000

Youtube Results For Cplusplus Tutorial
C, C++ tutorial lesson 1 the compiler

7.97 min. | 5.0 user rating

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admin — Fri, 01 Jun 2007 05:00:00 +0000

Youtube Results For C Tutorial
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Yahoo Answers For C Tutorial

Question C# Tutorial?
Anyone know a really good free online C# Tutorial? For someone with absolutley 0 knowledge of programming.

The Best Answer C# is a pretty simple language to get started with but will entertain you for weeks with the availability of lots of sophisticated techniques.

You really need to learn the IDE, so get to grips with Visual Studio Express or SharpDevlop. Only installed, you will have a ‘Hello World!’ application in 5 minutes, then learn how to use the IDE to generate code rapidly. There are lots of examples of code around to study but take a look at Design Patterns to set you off on the right track for good programming.

Cpp 3d Game Programming Tutorial

admin — Tue, 25 Jan 2005 06:50:31 +0000

A Guide to Refurbished Dell Computers

If you are looking into purchasing a new computer you would be remiss NOT to first consider purchasing a quality refurbished PC. Refurbished computers generally offer all the computing power, features and reliability you will need at a fraction of the price of a new one. Whether you are purchasing a first or second computer for home, buying for a school or school district, or a business looking to upgrade or expand, refurbished computers should be considered as an alternative to pricier new machines.

What is a refurbished computer?

A refurbished computer is any computer that has come from a working environment, be it business or personal, and has been reconditioned to like new condition for resale. This can include machines that were leased by businesses, schools, or government organizations and computers that are traded in by home users. Generally speaking the computers that make the best option for refurbishing and reselling are business class machines. Business class computers were designed with corporate users in mind and are developed to be reliable, upgradeable, and easily maintained. Quite simply these computers are built to work every day and every time, year after year. Examples of these computers include but are not limited to the Dell Optiplex line; including the Dell Optiplex GX150, GX240, GX260, GX270 and GX280. Other Dell business variations would include GX50 and GX60 machines and Dell Precision machines. The Dell Optiplex and Precision lines were designed with business in mind and are extraordinarily reliable, easy to maintain and upgradeable. Computers that were originally designed for the home user often do not come close to meeting the quality standards set by their business counterparts and as such should be considered to be a somewhat less desirable option.

Generally there are two distinct types of refurbished computers available, off lease and factory refurbished computers. Factory refurbished equipment has been retuned to the original manufacture, usually by a dissatisfied consumer. This equipment is then reworked by the manufacturer and sold as such; generally these computers come with a reasonable warranty, the original manufacturers guarantee, and a premium price. Off-lease refurbished machines are refurbished by the seller and not the manufacturer. Off-lease machines generally offer the same reliability, conditioning, options and warranties as those refurbished by the manufacturer but can often be found at a significant discount compared to factory refurbished equipment.

Where do refurbished computers come from and if they are so reliable why are they available?

Businesses, Government organizations and schools generally lease their computers and equipment for a period of time ranging from months to a few years. At the end of a lease many organizations opt to return this completely functional and useful equipment to comply with their accounting practices. You may ask why organizations would return completely functional equipment only to spend millions replacing it. The answer is simultaneously simple and complex, but in brief; most companies adapt accounting practices that devalue their computer and office equipment yearly as a tax benefit. Generally, at the end of three years, companies show that their existing equipment has no value and accept that the purchase of new equipment is merely a part of their accounting practices and not a waste of good equipment and money. Refurbished computers almost always come out of a clean, well maintained corporate environment. These computers are generally in a working condition, other than perhaps some minor flaws, or cosmetic damage. Other sources for refurbished computers include customer returns, floor or testing models.

How to tell if you are good candidate for a refurbished computer.

Refurbished computers are an excellent choice for virtually all but the most demanding power users. Many refurbished computers today can offer virtually identical performance as new equipment and at less than half the cost. It is important to ask yourself what kind of user you or your organization is. Those users who only want to work in Microsoft Office applications may have drastically different computing needs than people who want to play 3D games or edit video. Those of you who are into the latest and greatest computer games, video editing or CAD programs may need to invest in a new computer.

If you are purchasing for a business, school or government organization, very few users on your network will be power users. This gives you a great opportunity to save your organization thousands, if not tens of thousands of dollars, by supplying computers to your users that specifically meet their needs.

Home users generally do not need the latest and greatest in computer technology. Most home users are looking for solid internet access, the ability to edit photos, download music and play simple games, all of which can be easily handled by most refurbished computers. Home users who consider themselves to be power users can often tweak a refurbished computer to meet their needs and save hundreds of dollars in the process.

Most major manufactures offer potential customers the illusion that newer is better. In most instances this simply isn’t true, refurbished computers can meet the needs of virtually any user and at a fraction of the cost of new.

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