Instructions

Ellen is making a game where the player has to fight aliens. She has just learned about Object Oriented Programming (OOP) and is eager to take advantage of what using classes could offer her program.

To Ellen's delight, you have offered to help and she has given you the task of programming the aliens that the player has to fight.

1. Create the Alien Class

Define the Alien class with a constructor that accepts two int parameters x and y, putting them into x_coordinate and y_coordinate member variables. Every alien will also start off with a health level of 3, so the health member variable should be initialized as well.

health should be a private member variable. To let other parts of the program read the health information, Ellen wants to have a public get_health() method which returns an int.

Now, each alien should be able to internally track its own position and health.

2. The hit Function

Ellen would like the Alien class to have a hit method that decrements the health of an alien object by 1 when called. This way, she can simply call some_alien_instance.hit() instead of having to manually change an alien's health. Make sure that the health points do not drop below zero. The function should return true. Ellen wants to introduce shields at a later point, which would then report false if the shield is up.

3. The is_alive Function

You realize that if the health keeps decreasing, at some point it will probably hit 0. It would be a good idea to add an is_alive method that Ellen can quickly call to check if the alien is... well... alive. 😉 some_alien_instance.is_alive() should return a boolean.

4. The teleport Function

In Ellen's game, the aliens can teleport! You will need to write a teleport method that takes x_new and y_new values, and changes the alien's coordinates accordingly. For the time being, the function should return true. Ellen wants to add teleport-blocking bombs in later levels, which would then report false for failed teleporting attempts.

5. The collision_detection Function

If the aliens can be hit by something, then they need to be able to detect when such a collision might occur. Ellen needs to know if two aliens occupy the same coordinates. The collision_detection() function takes another alien object as an argument and returns a bool.