M150B
TMA – Fall 2013/2014
Cut-off date: 7-Dec-13
Total marks: 80
Arab Open University
Faculty of Computer Studies
M150 Data, computing and information
Question 1 [20 marks]
1. Write JavaScript program according to the following:
a. Define a JavaScript function occurrence(anArray,num), that takes an array anArray and a number num as arguments. The
function returns the number of occurrences of num in anArray.
b. Declare an array of 10 elements.
c. Ask the user to enter any 10 numbers and fill them in the array.
d. Print the array elements in the output window.
e. Using the function occurrence(), display on the screen the number of occurrences
of number 0 in the array. If the
number 0 doesn’t exist in the
array, you should display a suitable message also.
f. Run your program two times: one where the number 0 is an element on the
array and another time where the number 0 is not in the array. Provide two screenshots of
the two required outputs of your program. This should also show the arrays
elements.
Question 2 [20 marks]
In unit9, page 21 you were introduced to the methods associated with Date object. In the same
unit, section 4.2 you learned how to use functions from the
"dateLibrary.js" in JavaScript programs. The specifications for all
the functions in this library are in Appendix 1 at the end of unit 9.
Write JavaScript statements to do the following:
a. Create a Date object representing the date 2 June 1950.
b. Create another Date object representing the date 13 November 2013.
c. Calculate the difference in years between the two dates and print
it in the output window.
d. For the Date object you've created in a. do the following:
- Change the state to be 30 December 2000. You should not create a new
date.
- Display the day name.
- Display it in long form.
e. Insert a screenshot that shows the resulted output of parts c and
d.
f. Provide a copy of the specifications of all the functions you’ve
used in writing your program.
g. What information do we usually find in function specifications?
Question 3 [20 marks]
You are required to model a new user-defined object type, Game.
The Game
object
type has the following properties:
name:
a string representing the name of the Game.
level: a string representing the level of the game, such as easy, moderate,
difficult.
chance: a number (from 1 to 6) representing the chance of playing the game.
The Game
object
can go forward to further chances, however, the maximum value of chance is 6.
The Game
object
type has the following methods:
getName(): a method that returns the name of the game.
getLevel(): a method that returns the level selected of the game.
getChance(): a method that returns the chance of playing the game.
moveForward(): a method that gives the next chance (i.e. increments chance by 1) only if the chance is less than 6. Otherwise, set it to
1.
displayInfo(): a method that displays the name, level and the chance of the game in an alert box, using the three
methods: getName()
and getLevel() and getChance().
a. Write the Game constructor function Game(aName, aLevel, aChance).
b. Implement the methods getName(),getLevel (), getChance(), and displayInfo() according to the above specifications.
c. Prompt the user for values of name and level of a game he wants to create.
d. Create a game instance and initialize its properties by the values entered by the
user. Chance should be set to 1.
e. Use an appropriate methods to:
−
Increment
the game by two chances.
−
Print the game information.
f. Run your program and test it to make sure it
works properly. In your Solution document insert two screenshots: [3]
−
one
showing the program prompting for the game name, with you having entered the
name but not yet pressed OK;
−
one
showing the resulted alert window.
Question 4 [20 marks]
1. Briefly define the term HCI. What's the purpose of this kind of
study? [4 marks]
2. What is a user interface? Give two examples of user interfaces you
use in your daily life. [6 marks]
Important note: In your answers to questions 1, 2 and 3, you should
follow good programming style that helps readability. This includes:
•
Using
short comment at the beginning stating the purpose of your program.
•
Using
spacing and indentations to help make the structure of your program clear.
•
Following
the M150 style guidelines when choosing names for the variables (Refer to
section 2.2 of unit 7 page 16)
