Unit 3 Assignment

String & Math
AP Computer Science 2021-22 / Dr. Kessner

Reading

Eck Section 2.3.3 (Operations on Strings)
Look at the online docs for the String class (i.e. look at the intro, and skim down the list of functions to see what’s available, find the functions we use in class).
Look at the online docs for the Math class

Coding Bat practice

Do these exercises on Coding Bat Warmup 1.

nearHundred
missingChar
backAround
startHi
hasTeen
mixStart
close10
monkeyTrouble
loneTeen
notString

Note: There is nothing to turn in for this part.

Code

Choose two of the above Coding Bat exercises involving the String class, and implement fully with at least 3 unit tests each.

Greetings. Write a function greetings() that takes a single String name and returns returns a greeting using the given name. Be sure to include unit tests.

Sample output:

 greetings("Dr. Kessner") -> "Hello, Dr. Kessner, how are you?"
 greetings("Ascii Cat") -> "Hello, Ascii Cat, how are you?"
 greetings("Sydneys") -> "Hello, Sydneys, how are you?"

Attention. Write a function attention() that takes a single String as input and returns true if the string starts with “Hey, you!”. Be sure to include unit tests.

Sample output:
```
 attention("Hello, my name is Inigo Montoya.") -> false
 attention("Excuse me, Dr. Kessner?") -> false
 attention("Hey you! Give me your code!" -> true
```
Coin flip. Write a function that flips a coin randomly, returning a String, either “Heads” or “Tails”. Functions involving randomness are a little tricky to write unit tests for. So you should just have your main() function print the results from 10 or 20 coin flips to try out your function.
Die rolling Write a function that returns the result of rolling a single 6-sided die. In other words, when you call the function, it should randomly return 1, 2, 3, 4, 5, or 6.

Note: The Unit 3 Quiz will consist of writing functions involving Strings, like #2 and #3 above, including complete function declarations.