Methods Challenges

Complete the exercises below using a single .cs file. In the Main method, call each of the methods you define.

1 - Is it a Leap Year?

Write a method that takes in a year and determines if it is a leap year.

Leap years are defined as follows:

If the year is divisible by 4 then it is a leap year
Except if the year is divisible by 100 then it IS NOT a lear year
Except if the year is divisible by 400 then it IS a leap year

Write a program that asks the user for a year, and writes a message to the console telling the user whether or not the year they entered was a leap year.

2 - Bunny Eyes

Define a method named drawBunny that prints an ASCII bunny to the console. It should look something like this:

() ()
(. .)
(u u)

Once the method has been defined, update it so that it has a parameter. The parameter should determine the eyes for the bunny.

Example 1

drawBunny("*");

() ()
(* *)
(u u)

Example 2

drawBunny("-");

() ()
(- -)
(u u)

3 - Repeat Message

A user would like to be able to enter a message, and repeat it a certain number of times. For example, they could enter "Hello" and 3, and see the message "Hello Hello Hello". Define a method to handle this functionality.

Method Definition

Name: repeatMessage
Return type: void
Parameters: string message, int numberOfTimes

Use a while loop in the body of the repeatMessage function to print out the message the proper number of times. Use Console.Write instead of Console.WriteLine to write all of the repetitions on the same line.

Method Call

Use Console.WriteLine and Console.ReadLine to ask the user for a message, and store it in a variable named userMessage
Use Console.WriteLine, Console.ReadLine, and Convert.ToInt32 to get the number of times to repeat the message, stored in a variable named num
Call the repeatMessage method, and pass in userMessage and num

Run the code, and verify that it is possible to enter a message and a number, and see the message repeat!

4 - While Loop Methods

Update the code from the While Loop Challenges so that each program is defined as one method. The Main method should have a menu that allows the user to select which method to run.

5 - Recursion

Land of Lakes Example

In computer science, recursion occurs when a method calls itself in its own definition. Read through this article to learn more.

Fibonacci Sequence

The Fibonacci Sequence is a famous bit of mathematics, and it happens to have a recursive definition. The first two values in the sequence are 0 and 1 (essentially 2 base cases). Each subsequent value is the sum of the previous two values, so the whole sequence is:

0, 1, 1, 2, 3, 5, 8, 13, 21... and so on

Define a recursive fibonacci method that takes a number n and returns the nth fibonacci number, with n=0 representing the start of the sequence.

Examples

fibonacci(0) returns 0
fibonacci(1) returns 1
fibonacci(2) returns 1
fibonacci(3) returns 2
fibonacci(4) returns 3
fibonacci(5) returns 5
fibonacci(6) returns 8

Hint

The trick to defining a recursive method is to pretend the method is already defined. In the body of the fibonacci method, call the fibonacci method as if it will always return exactly what it should return.

6 - Countdown

Note: Google may be helpful for this challenge

Create a program that will ask the user for a date and the name of an event, and then display how many days there are until that date. For example, if today was 03/10/20 and the user entered 05/01/2020 as the date and my birthday as the event name, the program should say "There are 52 days until my birthday."

Write a method that takes the date and determines the number of days until that date
Write another that asks the user to input a date and event name and outputs the message with the countdown

Challenge items

The program should calculate the amount of time remaining in years, months, weeks, days, hours, minutes, and seconds
The program should properly handle invalid input (e.g., fake months like Smarch or invalid numbers like the 28.3th of April)
The program should be able to handle a date provided in as many forms as possible (e.g., 03/09/2019, March 9th, 2019, 9 Mar 2019, the 9th of March in 2019)

Extra challenge

The program should be able to display multiple countdowns at once
The program should store each countdown name/date in a text file, and load them from the text file each time the program runs

Challenges