Unit 2 Assignment#
Reading#
Eck Section 3.1 Blocks, Loops, and Branches (http://math.hws.edu/javanotes/c3/s1.html)
Eck Section 3.5 The
if
statement (http://math.hws.edu/javanotes/c3/s1.html#control.1.3)Supplemental: Wikibooks Java (Statements, Conditional blocks, Loop blocks, Boolean expressions) https://en.wikibooks.org/wiki/Java_Programming
Coding Bat#
Do these five exercises on Coding Bat Warmup 1 (http://codingbat.com/java/Warmup-1).
diff21
parrotTrouble
makes10
posNeg
icyHot
Note: There is nothing to turn in for this part. These Coding Bat exercises are really good practice, so feel free to come back to them periodically.
Code#
Choose two of the above Coding Bat exercises to implement and test on your own. Your class should include the function, a testing function, and multiple tests in
main()
.For example, if you pick
diff21
, you should write a class namedDiff21
in a fileDiff21.java
. The class should include astatic
function nameddiff21()
, and a function namedtestDiff21()
. You should call the test function on multiple inputs inmain()
.A person is a vampire if she is asleep during waking hours (6:00 to 22:00), or awake during sleeping hours (before 6:00 or after 22:00). Write a class with a static function
boolean isVampire(float hour, boolean awake)
wherehour
is the time represented as afloat
(e.g. 6.5 means 6:30), andawake
represents whether the person is awake, returningtrue
if that person is a vampire. Be sure to write a unit test function and a few tests.A store has marked down the prices of many items, but you only want to buy something if the discount is more than 25% (or in other words, the sale price is < 75% of the original price). Write a function
boolean goodDeal(double originalPrice, double salePrice)
that returns true if you’re getting a good deal on the item. Be sure to write a test function and several tests.
Note: The Unit 2 Quiz will consist of problems similar to #2 and #3, but you will be asked to write code for only the specified function, not the testing function or unit tests.
Bonus Exercise#
Write a program to print the prime numbers.
To do this, first write a function isPrime()
:
static boolean isPrime(int n)
{
// return true <-> n is prime
}
Then in your main()
function, loop through the first 100 integers and
print only the ones for which isPrime()
returns true.