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User Interface- Extended Definition

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User Interface
A User Interface (UI) refers to the component of a computer program through which humans and machines exchange data and instructions in order to complete a task (User Interfaces). The data and instructions can be exchanged through a growing number of mediums such as text or graphical stimuli.
Computer scientists go to great lengths to design and implement UIs, as they are imperative to the efficacy of the program they create. Without a working UI the computer and user would not be able to communicate with one another, severely limiting the ability of both. For instance, consider how difficult it would be to make a phone call if your phone did not provide you with a contact list or dialing pad. You would still be able to call, but it would take a much deeper level of knowledge to accomplish one of the phone’s most basic functions

TYPES OF UI
A UI will generally fall into one of 3 categories: command line, menu driven, and graphical
1. Command Line
The oldest and least common UI is the command line interface. The command line interface is comprised solely of text. This type UI will accept input almost exclusively through the keyboard and requires the user to be familiar with the commands it accepts since no implicit direction is given. For example, Figure 1 shows a command line UI of a grade calculating program. There is no information given to the user other than the text on screen. Command line UIs are the most resource efficient of the three types of UI, but due to the reliance upon user knowledge they are rarely used in modern applications.

Figure 1 Command line interface for grade calculator.

2. Menu Driven
A menu driven UI is one that will categorize all available data input into similar types before displaying it to the user. This is a more favorable interface for the average computer user. Since all useable options are readily

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