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Java
TOPIC 18 – TEST II REVIEW
DETAILS & REVIEW
DETAILS
The test
covers Unit 2. All notes. All work.
All class discussion is fair game.
Your test will be fully written. You
will not have a computer.
Minor
programming errors will not count against you.
The Java template
will be provided for you. So you do
not have to memorize the method prototype for the main function.
REVIEW
QUESTION 1
Define the
following terms.
Boolean variable
Boolean expression
Control flow structure
Condition
Conditional operator
QUESTION 2
What do each
of the following symbols stand for?
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Symbol
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Meaning
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>
>=
<
<=
==
!=
&&
||
!
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QUESTION 3
What will be outputted to screen? There may be cases where nothing is
outputted at all.
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a)
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int x = 0;
if (x >= 0)
{
System.out.println("A");
}
System.out.println("B");
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b)
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int x = 0;
if (x >= 0)
{
System.out.println("A");
}
else
{
System.out.println("B");
}
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c)
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int x = 10;
if (x > 0)
{
System.out.println("A");
}
else if (x > 5)
{
System.out.println("B");
}
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d)
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int x = 10;
if (x < 0)
{
System.out.println("A");
}
else if (x == 5)
{
System.out.println("B");
}
System.out.println("C");
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e)
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int x = 10;
if (x > 0)
{
System.out.println("A");
}
if (x > 5)
{
System.out.println("B");
}
System.out.println("C");
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f)
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int x = 5;
if (x == 0)
{
System.out.println("A");
}
else
{
System.out.println("B");
}
if (x == 0)
{
System.out.println("C");
}
else
{
System.out.println("D");
}
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g)
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int x = 12;
if (x == 0)
{
System.out.println("A");
}
else if (x < 100)
{
System.out.println("B");
}
else if (x == 12)
{
System.out.println("C");
}
else
{
System.out.println("D");
}
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h)
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int coco = 25;
int nono = 43;
if (coco < 20 || nono < 10)
{
System.out.println("A");
}
System.out.println("B");
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i)
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String s =
"hello";
if (!s.equals("hi"))
{
System.out.println("A");
}
else
{
System.out.println("B");
}
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j)
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int coco = 25;
int nono = 43;
if (coco < 20 && nono < 10)
{
System.out.println("A");
}
System.out.println("B");
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QUESTION 4
Consider the following code and state the odds that the letter B will be
outputted to screen. A link to the
solutions is at the bottom of this question.
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a)
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double rand = Math.random();
if (rand <= 0.40)
{
System.out.println("A");
}
else
{
System.out.println("B");
}
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b)
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double rand = Math.random();
if (rand <= 0.20)
{
System.out.println("A");
}
else if (rand <= 0.50)
{
System.out.println("B");
}
else
{
System.out.println("C");
}
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c)
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double rand = Math.random();
if (rand <= 0.10)
{
System.out.println("B");
}
else if (rand <= 0.50)
{
System.out.println("A1");
}
else if (rand <= 0.80)
{
System.out.println("A2");
}
else
{
System.out.println("B");
}
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d)
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double rand1 = Math.random();
double rand2 = Math.random();
if (rand1 <= 0.50)
{
if (rand2 > 0.40)
{
System.out.println("A");
}
else
{
System.out.println("B");
}
}
else
{
System.out.println("C");
}
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Click here for solutions to this question.
QUESTION 5
Write a program that asks you for your favourite sports team. It then gives a corresponding
responses. Half of the time, the
response is positive and half of the time it is negative.
There are two possible positive responses with the same odds of being chosen:
"Go team go!" and "I
love the team!".
There are three possible negative responses with the same odds of being
chosen: "Boo team!", "Oh, I don't like the team!",
"You really like the team? Why?".
Be careful to have the correct punctuation on all possible responses. Note, the exclamation mark.
SAMPLE OUTPUT
What is your favourite sports
team?
Senators
You really like the Senators? Why?
QUESTION 6
Write the program that asks the user for the current hour during the
day. It then asks if it is in the AM
or PM. Based on the provided
information, the program outputs one of the following messages:
11PM
to 3AM – Get to bed!
4AM to 6AM – Already up?
7AM to 11AM – Good morning
12PM to 5PM – Good afternoon
6PM to 10PM – Good evening
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