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Note The exercises below are based on a game where a spaceship avoids obstacles in space. The ship is positioned at the bottom of a coordinate system and can only move left and right while obstacles "fall" from top to bottom. Throughout the exercises, you'll create classes to represent different types of spaceships that can be used in the game. The base class Spaceship and one subclass Fighter have been provided for you below.

Note The exercises below are based on a game where a spaceship avoids obstacles in space. The ship is positioned at the bottom of a coordinate system and can only move left and right while obstacles "fall" from top to bottom. Throughout the exercises, you'll create classes to represent different types of spaceships that can be used in the game. The base class Spaceship and one subclass Fighter have been provided for you below.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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How do I solve this exercise on classes using Swift code? Classes 3/4

Exercise - Override Methods and Properties Note The exercises below are based on a game where a spaceship avoids obstacles in space. The ship is positioned at the bottom of a coordinate system and can only move left and right while obstacles "fall" from top to bottom. Throughout the exercises, you'll create classes to represent different types of spaceships that can be used in the game. The base class Spaceship and one subclass Fighter have been provided for you below. class Spaceship { var name: String var health = 100 var position func moveleft() { position -= 1 } func moveRight() { position += 1 } func wasHit() { health -= 5 if health <= 0 { print ("Sorry, your ship was hit one too many times. Do you want to play again?") } } } class Fighter: Spaceship { var weapon = "" var remainingFirePower = 5 func fire() { if remainingFirePower > 0 { remainingFirePower } else { print("You have no more fire power.") -= 1 } } }
Transcribed Image Text:Exercise - Override Methods and Properties Note The exercises below are based on a game where a spaceship avoids obstacles in space. The ship is positioned at the bottom of a coordinate system and can only move left and right while obstacles "fall" from top to bottom. Throughout the exercises, you'll create classes to represent different types of spaceships that can be used in the game. The base class Spaceship and one subclass Fighter have been provided for you below. class Spaceship { var name: String var health = 100 var position func moveleft() { position -= 1 } func moveRight() { position += 1 } func wasHit() { health -= 5 if health <= 0 { print ("Sorry, your ship was hit one too many times. Do you want to play again?") } } } class Fighter: Spaceship { var weapon = "" var remainingFirePower = 5 func fire() { if remainingFirePower > 0 { remainingFirePower } else { print("You have no more fire power.") -= 1 } } }
Define a new class ShieldedShip that inherits from Fighter. Add a variable property shieldStrength that defaults to 25. Create a new instance of ShieldedShip called defender. Set name to "Defender" and weapon to "Cannon." Call moveRight() and print position, then call fire( ) and print remainingFirePower. Go back to your declaration of ShieldedShip and override wasHit(). In the body of the method, check to see if shieldStrength is greater than 0. If it is, decrement shieldStrength by 5. Otherwise, decrement health by 5. Call wasHit() on defender and print shieldStrength and health. When shieldStrength is 0, all wasHit() does is decrement health by 5. That's exactly what the implementation of wasHit() on Spaceship does! Instead of rewriting that, you can call through to the superclass implementation of wasHit(). Go back to your implementation of wasHit() on ShieldedShip and remove the code where you decrement health by 5 and replace it with a call to the superclass' implementation of the method. Call wasHit() on defender, then print shieldStrength and health.
Transcribed Image Text:Define a new class ShieldedShip that inherits from Fighter. Add a variable property shieldStrength that defaults to 25. Create a new instance of ShieldedShip called defender. Set name to "Defender" and weapon to "Cannon." Call moveRight() and print position, then call fire( ) and print remainingFirePower. Go back to your declaration of ShieldedShip and override wasHit(). In the body of the method, check to see if shieldStrength is greater than 0. If it is, decrement shieldStrength by 5. Otherwise, decrement health by 5. Call wasHit() on defender and print shieldStrength and health. When shieldStrength is 0, all wasHit() does is decrement health by 5. That's exactly what the implementation of wasHit() on Spaceship does! Instead of rewriting that, you can call through to the superclass implementation of wasHit(). Go back to your implementation of wasHit() on ShieldedShip and remove the code where you decrement health by 5 and replace it with a call to the superclass' implementation of the method. Call wasHit() on defender, then print shieldStrength and health.
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