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PRESENTED BY-

Debarati SahaDeepak Mahanty

USER INTERFACE

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OVERVIEW

>USER INTERFACE

>TYPES OF UI

>VERIFICATION & VALIDATION

>AESTHETICS

>C++ STREAMS

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WHAT IS INTERFACE

>>Interactions between humans and machines

>>User Interface involves both hardware andsoftware components that provide means of :

Input

Output

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NEED FOR GOOD INTERFACE

>> First impression/look

>> User-friendliness

>>Less error

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TYPES OF INTERFACE

>>The most common types of User Interfaces arelisted below:

Command-line User Interface (CUI)

Graphical User Interface (GUI)

Web User Interface (WUI)

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COMMAND USER INTERFACE(CUI):

In a CUI:

>> The user provides the input bytyping a command string with the

computer keyboard

>> The system provides output byprinting text on the computer

monitor.

Eg. DOS,UNIX

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Advantage & disadvantages of CUI:

>>ADVANTAGE:

->complicated operations can be completed using a shortsequence

>>DISADVANTAGE:

->not user friendly

->hard to memorise all commands

->poor aesthetic value

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GRAPHICAL USER INTERFACE(GUI):

>>Using visual elementsrather than textcommands

>>Eg. M.S. Word,Windows, Android

>>Basic Components of aGUI:1.Pointer2.Pointing device3.Icon

4.Windows5.Menus6.Toolbar

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ADVANTAGE & DISADVANTAGES OF GUI:

>>ADVANTAGE:

-> Decrease in training cost and support line cost

-> Increase in customer satisfaction

>>DISADVANTAGE:

->Need of proper hardware support(RAM,Hard disk

space,processing power)

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WEB USER INTERFACE(WUI):

>>Accepts input and

provide output bygenerating webpages which aretransmitted via theInternet

>>Viewed by the userusing a web browserprogram

Eg. Google, Ultimatix

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ADVANTAGE & DISADVANTAGES OF WUI:

>>Benefits and Attributes that apply to GUI also apply to a WUI

>>Disadvantages:

->Browser dependancy

->Performance depends on internet speed

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VERIFICATION & VALIDATION

>> VALIDATION:Quality assurance process

Are you building the right thing?

>> VERIFICATION: Quality control process

Are you building it right?

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TYPES OF VALIDATION:

>>Client side

eg.To ensure all the mandatory fields have been filled on ascreen.

>>Server side

eg.Mismatch in username & password

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AESTHETICS:

>>look and feel aspect of the application.

>>easy interaction

>>end user comfort level.

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Elements of Aesthetics

Aesthetics

Color

Visual WeightTexture

Line

Pattern

Shape

Contrast GraphicsPhotos

Sharpness

Movement

Scale

Balance

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C++ STREAMS:

1.The Standard Output Stream

->cout

2.The Standard Error Stream

->cerr

3.The Standard Input Stream

->cin

4.The Standard Output Stream for logging

->clog

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USE OF cin& cout :

Input

OUTPUT

input

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February 7, 2011TCS Internal 1

VALIDATION:Handling Invalid input to cin

What happens if you supply invalid value to cin?

Example:

#include

using namespace std;

main()

{

int x,y;

coutx;

couty;

cout

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February 7, 2011TCS Internal 1

Handling Invalid input to cin - Solution

#include #include using namespace std;main(){

int x,y;cout x)){

cout

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THANK YOU!