TECHNOLOGY GENERATIONS

1G WIRELESS TECHNOLOGY:

·        USING ANALOG SIGNALS

·        LISTEN TO HANDSET

·        FREQUENCY TYPICALLY 150 MHZ AND ABOVE

DRAWBACKS:

·        POOR VOICE QUALITY

·        POOR BATTERY LIFE

·        NO SECURITY

·        LARGE PHONE SIZE

·        FREQUENT CALL DROPS

·        LIMITED CAPACITY AND POOR HANDOFF RELIABILITY

2G WIRELESS TECHNOLOGY:

·        2G phones using global system for mobile communications(GSM) were first used in the early 1990 s in Europe.

·        GSM provides voice and limited data services and uses digital modulation for improved audio quality.

·         Digital AMPS , CDMA were some of the 2Gsystems.

FEATURES INCLUDES:

·        TEXT

·        SMS

·        FAX

·        2 DIMENSIONAL

DRAWBACKS:

·        Range of sound is very small

·        Weaker digital signal

2.5 WIRELESS TECHNOLOGY:

·        An interim stage that is taken between 2G and 3G that is 2.5G

·        Features includes:-

o   Phone calls/

o   Fax

o    Voice mail

o    Send/Receive e-mail messages

o    web browsing

o    camera phones

o    speed: 64-144 kb/sec

o    Time to download a 3 min MP3 song: 6-9 min

3G WIRELESS TECHNOLOGY:

·        To meet the growing demand in network capacity, rates required for high speed data transfer and multimedia applications, 3Gstandards started evolving.

·        It is based on the International Telecommunication Union (ITU) family of standards.

·        3G technologies enable network operators to offer users a wider range of more advanced services.

·        Services include wide-area wireless voice telephony, video-calls and broadband wireless data, all in a mobile environment.

·        The data are sent through the technology called Packet switching.

·        Voice calls are interpreted through circuit switching.

FEATURES:

·        Phone calls/ fax

·        Global roaming

·        Send/receive large email messages

·        High speed web

·        Navigation / maps

·        Video conferencing

·        TV streaming

·        Electronic agenda meeting reminder

·        Speed: 200 kb/sec-2mb/seC

·         Time to download a 3 min MP3 song:

·         11 sec-1.5 min

ADVANTAGES

MUSIC!!:

·        You can access to downloadable music, with no cables or PC.

GAMING TO THE NEXT LEVEL:

·        3G technology has taken the gaming to the next level.

·        Real-time multiplayer gaming is possible in 3G system.

·         Innovative new services are being added by developer daily.

How Wi-Fi improved our lives

How Wi-Fi improved our lives

WHAT IS WIFI?

“Wi-Fi is a Local Area Wireless Technology that allows an electronic device to participate in computer networking over a short distance.”

 FUNCTIONALITY

·         Many devices can use Wi-Fi, e.g. personal computers, video-game consoles, smartphones, digital cameras, tablet computers and digital audio players. These can connect to a network resource such as the Internet via a wireless network access point.

·          Such an access point (or hotspot) has a range of about 20 meters (66 feet) indoors and a greater range outdoor

WIFI TODAY :

·         Now we have WiFi, it’s sometimes harder to think what we can’t do, rather than what we can. With WiFi we have the internet instantly at our fingertips, as long as we have a smartphone, mobile device or laptop close to hand.

IMAGINE LIFE WITHOUT INTERNET

 • Nowadays, it’s hard to imagine what life would be like without the internet.

 • Staying in touch with people far away would require posting a letter.

 • Banking involved lengthy queues in the local branch.

• Literature would be taken out from the library, a book to read to pass the time or some educational content to help with studies.

• Application forms might take several attempts to get spelling and grammar accurate.

 • To plan a journey you would take out a map. A trip into town was the only way to check out the latest fashions and comparing prices would require you to visit all the shops and look around.

 • Party invites went out by paper, word of mouth or a phone call.

 WIFI USED AT VARIOUS PLACES

• Wi-Fi provides service in private homes, businesses, as well as in public spaces at Wi-Fi hotspots set up either free-of-charge or commercially, often using a captive portal webpage for access.

 • Organizations and businesses, such as airports, hotels, and restaurants, often provide free-use hotspots to attract customers. Enthusiasts or authorities who wish to provide services or even to promote business in selected areas sometimes provide free Wi-Fi access.

. WIFI IN CAMPUS

• Like in our college, there is wifi network connectivity that is easily accessible by all students

. • The wifi helps students providing internet services for free and helps students in studies by letting them search and study on internet.

• Students also get the chance to do online courses and the global English programs in the university itself by the use of internet available through the wifi.

WIFI IN HOUSE:

·         Nearly wifi is installed in every house.

 APPLICATIONS OF WIFI

            • Sync Your Music Library, Photo Library, or Other Files with Your Smartphone USB-Free

 • Wirelessly Transfer Photos from Your Digital Camera

• Share Files with Nearby Computers

 • Stream Movies to Any TV in the House

• Forward Notifications from Your Smartphone to Your PC ,If you're rocking an Android phone .

 • Send Documents to Your Printer from Any Computer or Smartphone

SWITCH STATEMENT IN C++ VS. IF ELSE IF STATEMENT

SWITCH STATEMENT IN C++ VS. IF ELSE IF STATEMENT

SWITCH STATEMENT:

SYNTAX=

switch(expression)

{

    case constant-expression1  :

       statement(s) 1;

       break; //optional

    case constant-expression 2 :

       statement(s) 2;

       break; //optional

.

.

.

.

.

.

case constant expression n:

Statements n ;

break;//optional 

    // you can have any number of case statements.

   default : //Optional

       statement(s);

}

if else if statement:

Syntax:

if(condition1)

{

Statements 1;

}

else if(condition 2)
{

statements 2;

}

else if(condition 3)
{

statements 3;

}

.

.

.

.

.

.

Else if(condition n)

{

Statements n;

}

Else

{

Statements;

}

Similarities:

·        Both are used to compare more than one conditions

·        In both if else if and switch statements if one condition is true its statements are executed and other conditions are not even tested

·        Both are alternatives of each other

Differences:

·        There is a lot of difference in their syntaxes

·        In if else if if none case is matched else is executed in switch default is executed

·        The main difference in both the statements is that in if else if we can compare a value with a certain range but in switch the operand must be a character or an integer so we cannot compare range the value should be exact that character or integer

As we can see in the example

#include<iostream>

using namespace std;

void main()

{

     Int num;

Cout<<”enter the number”

Cin>>marks;

if(num>0&&num<33)

          {

                   Cout<<”fail”;

}

else if(marks>=33&&marks<=60

{

          Cout<<”just pass”;

}

else if(marks>=61&&marks<=100)

{

cout<<”great marks”;

}

else

cout<<”wrong choice”;

}

We can’t do it using switch

ios operating system

ios operating system

What is iOS?

“iOS (originally iPhone OS) is a mobile operating system created and developed by Apple Inc. and distributed exclusively for Apple hardware.”

·         The iOS is derived from MAC (OSX)

When it was developed?

Originally unveiled in 2007, for the iPhone, it has been extended to support other Apple devices such as the iPod Touch,iPad ,iPad Mini and second-generation Apple TV.

Android’s interface:

The iOS user interface is based on the concept of direct manipulation, using multi-touch gestures. Interface control elements consist of sliders, switches, and buttons. Interaction with the OS includes gestures such as swipe, tap, pinch, and reverse pinch, all of which have specific definitions within the context of the iOS operating system and its multi-touch interface.

Devices supporting Android:

·         I PHONE

·         I POD TOUCH (1^ST GENERATION)

·         I PHONE 3G

·         I POD TOUCH (2^ND GENERATION)

·         I PHONE 3GS

·         I POD TOUCH (3^RD GENERATION)

·         I PAD

·         I PHONE 4

·         I P0D TOUCH (4^TH GENERATION)

·         I PAD 2

·         I PHONE 4S

·         NEW I PAD

·         I POD TOUCH (5^TH GENERATION)

·         I PAD MINI

·         I PHONE 5

·         I PAD

·         I PHONE 5C

·         I PHONE 5S

·         I PAD AIR

·         I PAD MINI 2

·         I PHONE 6

·         I PHONE 6 PLUS

·         I PAD AIR 2

·         I PAD MINI 3

Advantages of iOS

·         Performance is awesome

·         Generates less heat when compared to Android

·         Best gaming experience

·         Vast number of applications

·         Suits for business and gaming

·         Latest version has two notification menus

·         Excellent security

·         Multitasking

·         Feel is awesome

·         Excellent for media entertainment

·         Multilanguage support

·         Quick settings in notification bar

·         As light as feather

·         Fits in the hand

·         Metal and shiny coating is ultimate for Apple devices

·         Many cases and covers makes it waterproof

·         Sapphire glass which is hard

·         Finger print scanning gives tough security

·         Excellent camera quality even though mega pixels are less

·         Developers can design apps because less number of models

Disadvantages of iOS

·         Not flexible only supports iOS devices

·         Not open source

·         The main disadvantages of using iOS is costly Apps and no widget support

·         Apple restricted the connectivity with itunes, 

·         Devices are very pricey

·         Applications are very large when compared to other mobile platforms

·         Supports only single SIM

·         Very addictive, once if you used iDevices you can’t switch back to another

·         Battery performance is very poor on 3G,4G

·         Repair empties your wallet