Programming & Computer Science Answers

If u pry off the lid of a paint can the fulcrum is

a the handle of the screwdriver

b the rim of the paint can

c the lid if the paint can

d the tip of the screwdriver

Do a C++ code to create the following output using only two or more parallel arrays:

Create two parallel arrays, one for actors or actresses and one for their phone numbers with the following data:

Actors: Angelina Jolie, Brad Pitt, Margot Robbie, George Clooney, Jennifer Lopez, Jennifer Lawrence

Info: 949-232-1124, 949-865-3492, 864-235-7569", 939-453-2288, 987-209-2132, 543-239-8745

Prompt the user for a number from 1 to 6 and based on the number, display the actor’s name and related phone number. If the number is not between 1 to 6, an error message as you see below should be displayed.

You should prompt the user if he or she likes to continue and upon Y or y you clear the screen and repeat until the response is N or n 

Select two countries (excluding the United States) and prepare a short report describing their basic Internet infrastructures. Are they public or commercial? How and where do they connect to backbones within the United States

convert the regular expression to E-NFA

1) a*

2) a+

3) a+b

4) a.b

Question 4 a)

The Human-Computer Interaction (HCI) involves two main entities, these are the human entity and the computer entity. To help in designing a usable computer system, we need to understand the human aspects from the cognitive, social, and organizational perspectives. Assuming you are the lecturer for the day, explain stating the difference between these three (cognitive, social, and organizational) perspectives.

b) The arrangement of information on the interface’s display is important to avoid frequent movement of eyes by users while searching for information. The frequent movement of eyes would cause the eyes to constantly refocus and this action would easily tire the eyes. Elaborate on five (5) on considerations in designing a system interface.

c) Color plays an important role in determining the identity and shape of an object. Explain in your own words the three components that forms color. 

Question 3

a) The basic goal of HCI is to improve the interactions between users and computer systems by making computers more usable and receptive to the user’s needs apart from being able to function well. Applying all the usability heuristics by Jakob Nielson. Analyze how these heuristics were applied in the development of LEMASS.

b) The selection of input technology to be used in the interaction between humans and computers should be done carefully, as many input devices used may not always be suitable to the existing conditions. Explain to your brother in primary five with examples the differentiation between input technology and input devices.

c) Convincing him in your own words, describe four (4) factors that influence suitability of input devices.

 Question 2

a) When designing a system to support group communication in an organization, there is a number of issues that need to be taken into consideration. Explain to your junior brother, five (5) of these factors to consider when designing a system for an organization with at least two relevant examples.

b) The main goal of the Human-Computer Interaction is to produce a system that is easy and safe to be used, apart from being able to function well. This computer system should not just be easily usable, but also easily assembled, studied and maintained. Discuss stating at least, one example of the usability goals.

c) Examples of sounds are voices in conversation and music. Too much sound would only serve as a disturbance to users. Explain briefly five (5) applications that are suited to use sounds as a form of reactive response.

a) The success of the system depends on the depth of difficulty that is faced by users to study and use the system. Learning is a complex process; thus, a good system needs to help users in the process of learning. It is normally assumed that users are able to learn everything from documentations and guidance books. But, in reality, not many users refer to these guide books or documents. Critically examine five (5) problems faced by users in the process of learning a new system.

b) Face to face communication is said to be the simplest form of communication. However, it is associated with its own problems. Using examples, illustrate these problems in the easiest ways to your cousin in JHS.

c) Based on your knowledge in HCI, propose and defend your solution on how these problems can be overcome technologically.

Write a GUI to visualize electric field lines of point charges located in a plane.

The functionality the program should provide

• Positive and negative point charges are displayed as blue and red dots, respectively.
• The area of the dot is proportional to the magnitude of the charge.
• 32 field lines emerge from each positive charge
• A left-mouse press and release on a charge deletes the charge
• A left-mouse press not on a charge followed by a mouse motion adds a charge as follows:
•  location of new charge is the mouse-press position.
•  magnitude of the charge is round(dx), where dx is the x-positional difference between location of mouse-release and mouse-press. 
• A left-mouse press on a charge followed by a mouse motion drags the charge resulting in:
• charges being redrawn,
• field lines being recalculated and displayed.
• For better responsiveness, in dragging mode only 8 field lines per charge are used and only the changed elements of the figure are redrawn, not the full figure.

The monthly electricity charges (in cent) in the United State are calculated as follows;

First 50 units at 98

Next 100 units at 22 per 10 units

Next 150 units at 35 per 10 units

Next 300 units at 45 per 10 units

Remaining units at 60 per 10 units

a)     If New York used 945 units in a month, how much will he pay?

b)     Chicago paid 23.88 dollars for electricity he consumed in one month. How many units of electricity did he consumed?