Challenges

From 1 to 10

Print the list of numbers from 1 tot 10 to the console.

1 2 3 4 5 6 7 8 9 10

Even or Uneven

Create a program that prints out the numbers 0 to 10 and states if they are even or uneven. Do the even and uneven check using the modulo operator %.

Example output:

0 (even)
1 (uneven)
2 (even)
3 (uneven)
...
10 (even)

Summation

Request multiple numbers from the user and output the sum at the end of the application. Let the user stop inputting numbers by for example entering 0. Make sure to inform the user how to stop the process of entering numbers.

Example output:

Welcome to the summation application.

Please enter an integral number (0 to stop): 15
Please enter an integral number (0 to stop): 32
Please enter an integral number (0 to stop): -16
Please enter an integral number (0 to stop): 0

The total sum is 31

Thank you for using our application.

Pyramid

Output a pyramid to the console as shown below.

     -
    ---
   -----
  -------
 ---------
-----------

Higher / Lower

Create the higher / lower game. First the application should generate a secret random number (see code below). The user is then requested to enter numbers. After each guess you should output to the user if he/she has to guess higher or lower.

If the secret number is guessed, output a congratulations to the user.

To generate a random number, you can use the code below:

public static void main(String[] args) {
    Random generator = new Random();

    // Generate a random number between 0 (inclusive) and 5000 (exclusive)
    int secret = generator.nextInt(5000);
}

You will also need to import the Random library by adding import java.util.Random; to the top of your java file.

As an extra you can also output the number of guesses that were needed to guess the number.

Menu Options for Rectangle

Build an application that allows the user to calculate the area and circumference of a rectangle using the formulas:

area = (width * height)
circumference = 2 * (width + height)

The application should present the user with a menu as shown below to let the user select his/her next action.

Welcome to the rectangle calculator. Please select one of the options below.

1. Set the base of the rectangle
2. Set the height of the rectangle
3. Calculate the area
4. Calculate the circumference
5. Exit
---------------------------------
Please choose your action (number):

When the user chooses an action the action should be performed, after which the user should be presented with the menu again so he/she can choose his/her action.

Fibonacci numbers

Create an simple that calculates the first 20 numbers of the Fibonacci sequence and outputs them to the terminal. Calculate the sum of the numbers. It should be 17710.

In mathematics, the Fibonacci numbers are the numbers in the following integer sequence, called the Fibonacci sequence, and characterized by the fact that, every number after the first two is the sum of the two preceding ones. Start the series at the number 1.

Example:

1, 1, 2, 3, 5, 8, ...

Extra: Let the user decide at the start of your application how many numbers to generate.

A dice throwing game

Simulate a dice throwing game. Allow the user of your application to select the number of throws that can be simulated and also the number of eyes for the throws.

For example:

This is a dice throwing simulator. Select the number of throws you wish to simulate and the eyes of the dice to use.

Number of throws to simulate? 3
Number of eyes of the dice to use? 20

Throw 1: 12
Throw 2: 2
Throw 3: 19