Ruby Programming on Classes

Task: Design and implement a car class that contains various methods and variables to replicate real-world functionality

In considering a Car class, there is obviously a wide variety of information that we

could capture using instance variables. For this assignment, let's limit our instance

variables to encapsulate the make, model, and year.

For those instance variables, there are also some operations we want to conduct

using those values. We want to be able to retrieve and print out those values, initialize those values to some beginning state, and modify those values by reassigning them. We can do all those operations by defining instance methods in our Car class that accomplish those tasks.

So, our Car class design might look like this by way of a pseudo-code description:

Car instance variables

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

make

model

year

Car instance methods

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

get_make

get_model

get_year

set_make

set_model

set_year

__________________________

Criteria: Program should run like this:

$ classcar.rb

How many cars do you want to create? 2

Enter make for car 1: AstonMartin

Enter model for car 1: DB5

Enter year for car 1: 1962

Enter make for car 2: McLaren

Enter model for car 2: F1

Enter year for car 2: 2014

You have the following cars:

1962 AstonMartin DB5

2014 McLaren F1

$

________________________

Given Ruby File:

# DEFINE YOUR CAR CLASS HERE

# MAIN PORTION OF PROGRAM

# create empty array

array_of_cars = Array.new

# prompt for and get number of cars

print "How many cars do you want to create? "

num_cars = gets.to_i

# create that many cars

for i in 1..num_cars

# get the make, model, and year

puts

print "Enter make for car #{i}: "

make = gets.chomp

print "Enter model for car #{i}: "

model = gets.chomp

print "Enter year of car #{i}: "

year = gets.to_i

# create a new Car object

c = Car.new

# set the make, model, and year

# that we just read in

c.set_make(make)

c.set_model(model)

c.set_year(year)

# add the Car object to the array

array_of_cars << c

end

# print out the information for

# the Car objects in the array

puts

puts "You have the following cars: "

for car in array_of_cars

puts "#{car.get_year} #{car.get_make} #{car.get_model}"

end