Mid Term Quiz

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Mid Term Quiz

Choose the *BEST* answer for each question in the context of our class

First and last Name *

What is an operator? *

A thing that expresses some mathematical operation: +, -, *, = etc

A structure that can route requests around your program

A bunch of random symbols that do all sorts of things: +, -, *, = etc

The person you talk to when you dial 411

What is a variable? *

A thing that allows code to vary in a number of ways

A type of construction used to link two disparate structures

A container that can store an assortment of different things: numbers, strings, arrays, etc

Tuna fish sandwich

When programming - when is a good time to use a for loop *

When you are up late and feeling a little crazy

When you need to add a number to itself

When a while loop just isn't powerful enough

When you find yourself repeating the same code over and over again

Which metaphor is most appropriate for explaining the purpose of a conditional statement *

When you need to make a decision based on your current situation

To threaten someone who won't do what you want or need them to do

To train a certain aspect of your mind or body

Betting with the odds at a dog race

When programming when is a good time to use a function? *

When you have code you might want to use again

When you have code that you want to execute at some later and unknown time

To break a complex operation into manageable chuncks

all of the above

Why are events useful? *

They aren't really - it's just another thing to learn

They allow a program to respond to user input

They help you keep track of what's happening

They can respond to something that happens at an unknown time in the future

What is an effective use of an array? *

When you have several items that are similar

When you have several items that you have to preform the same operation on

When you don't know the number of items that will be created while using your program

All of the above

What is a class? *

An object with properties and methods

Something that is created during runtime that holds information about the program

A blue print or description of an object

What do you mean - we're in class now - aren't we?

How do you refer to properties and methods within a class? *

Ask the class directly with a soothing tone of voice

use the dot operator : somemovieclip.gotoAndStop()

A blue print or description of an object

What do you mean - we're in class now - aren't we?

Short answer

assume that all of the following expressions are written in order in the same program.

var donuts:Number = 2 + 4 * 5; *

what is the value of donuts?

What is the type of the variable donuts? *

Refers to the question above

donuts += 1; *

assuming the value of donuts was 22 before what is the value after the above operation?

donuts = "donuts"; *

assuming we are in the same file - what is the value of donuts after the above expression?

trace(donuts); *

What is the result of the above expression?

What is the type of donuts now? *

for(var i = 0; i < 10; i++) *

what is the value of i at the end of the loop?

if ( donuts == "glazed donut") { trace("it's glazed"); } *

In english - what question is the if asking?

if ( donuts == "glazed") { trace("it's glazed"); } *

assuming all of the above expressions are part of the same program - will the trace statement execute?

function make_glaze_donut() :String { return "glazed donut"; } *

how do you call the above function?

function glaze_donut(a_donut:String) :String { return "glaze " + a_donut; } //notice this function is not the same *

What is the return type of the above function?

trace(make_glaze_donut()); //notice this is the first function *

what will the above expression print to the console?

trace(glaze_donut(donut)); //notice this is the second function *

what does this function return?

var bag_of_donuts:Array = ['glazed', 'powered', 'jelly', 'boston cream', chocolate glazed', 'plain']; *

what is the value of bog_of_donuts[0] ?

trace(bag_of_donuts.length); *

what would this print to the console?

var donut_maker:DonutMaker = new DonutMaker(); *

What does the above statement do?

Assuming DonutMaker has a "make" method - how would you call it? *

Evaluate logical expressions

This is something you all have to know and get good at. So here are a few problems:

All of the following are Boolean Operators: && (and), || (or), ! (not) *

True

False

Which actionscript logical expression correctly determines whether the value of some_number lies between 0 and 100? *

0 < some_number < 100

0 < some_number && some_number < 100

0 > some_number && some_number < 100

0 > some_number && some_number > 100

(4 >= 4 && 8 < 1) *

Will the above return true or false?

true

false

!(4 >= 4 || 8 < 1) *

Will the above return true or false?

true

false

( (4 >= 4 && 8 < 1) || (44 == 33 || 5 > 3) ) *

Will the above condition return TRUE or FALSE? (This is a tough one, just think about it)

true

false

If p is a Boolean variable, which of the following logical expressions always has the value FALSE? *

p && p

p || p

p && !p

p || !p

b and d above

e. a, b, and c above

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