Coding Exercises: Functions and Testing
1. Vampire
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) where
hour is the time represented as a float
(e.g. 6.5 means 6:30), and awake represents whether the
person is awake, returning true if that person is a
vampire. Most importantly, write a unit test function and several
tests.
2. Good Deal
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. Most
importantly, write a unit test function and several tests.
3. (Challenge) Prime Numbers
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
}Write a unit test function and several unit tests for
isPrime().
Then in your main() function, loop through the first
100 integers and print only the ones for which
isPrime() returns true.