Ruby loop and array - arrays

Question

I've been trying to teach myself Ruby. I've found a few code problems to try solving, but I'm stuck. Here is what I have and the problems I'm trying to solve.
My algorithm is as follows:
Prompt the user to enter a number between 1 and 10 (inclusive).
Read that number into an appropriately named variable.
Test that the number lies in the appropriate range.
Input new number if it is out of bounds as per the condition.
Use the number entered by the user to create an array with that
number of elements.
Write a loop which will run through a number of iterations equal to
the size of the array.
Each time through, prompt the user to enter a text string - a name
(names of cars, that sort of thing).
Once the array is entered, display the contents of the array three
items to a line.
You will want a for loop for this, and within the for loop you should include a decision which will insert a line break at the appropriate places.
Also,
Separate the array elements with dashes - but do not put a dash
before the first element on a line, and do not put a dash after the
last element on a line.
Use a Ruby function to sort the array alphabetically, then display it
again, the same way as before.
Reverse the order of the array
Display its contents a third time, again putting three elements on each line of output and placing dashes the way you did with the first display effort.
loop do
print "Enter an integer between 1 and 10: "
s = gets.chomp.to_i
if s >0 && s <= 10
break
else
puts "Interger entered is outside specified range."
end
end
array=[]
array.size
loop do
print "Enter name of a car model: "
car=gets.chomp
array<<car
for i in array
array.slice(1..9) {|car|
puts car.join(", ")
}
end
end

Answer 1

Is that solution you looking for?
loop do
print "Enter an integer between 1 and 10: "
s = gets.chomp.to_i
if (1..10).include?(s)
arr = [""] * s
i = 0
while i < arr.length
print "Enter name of a car model: "
car = gets.chomp
arr[i] = car
i += 1
end
puts arr.join(", ")
break
else
puts "Interger entered is outside specified range."
break
end
end
Result is:
[retgoat#iMac-Roman ~/temp]$ ruby loop.rb
Enter an integer between 1 and 10: 2
Enter name of a car model: car_a
Enter name of a car model: car_b
car_a, car_b
UPDATE
Below solution to print an array by 3 elements per line with natural sorting
loop do
print "Enter an integer between 1 and 10: "
s = gets.chomp.to_i
if (1..10).include?(s)
arr = [""] * s
i = 0
while i < arr.length
print "Enter name of a car model: "
car = gets.chomp
arr[i] = car
i += 1
end
puts arr.sort.each_slice(3){ |e| puts "#{e.join(", ")}\n"}
break
else
puts "Interger entered is outside specified range."
break
end
end
Result is:
[retgoat#iMac-Roman ~/temp]$ ruby loop.rb
Enter an integer between 1 and 10: 4
Enter name of a car model: z
Enter name of a car model: a
Enter name of a car model: x
Enter name of a car model: b
a, b, x
z
And reverse sorting:
loop do
print "Enter an integer between 1 and 10: "
s = gets.chomp.to_i
if (1..10).include?(s)
arr = [""] * s
i = 0
while i < arr.length
print "Enter name of a car model: "
car = gets.chomp
arr[i] = car
i += 1
end
puts arr.sort{ |x, y| y <=> x }.each_slice(3){ |e| puts "#{e.join(", ")}\n"}
break
else
puts "Interger entered is outside specified range."
break
end
end
Result is:
[retgoat#iMac-Roman ~/temp]$ ruby loop.rb
Enter an integer between 1 and 10: 4
Enter name of a car model: z
Enter name of a car model: a
Enter name of a car model: x
Enter name of a car model: b
z, x, b
a

Answer 2

It's better to split you program into small pieces. Also, try not to use loop without necessity.
# Specify Exception class for your context
class ValidationException < RuntimeError
end
def number_of_cars_from_input
# Get user input
print 'Enter an integer between 1 and 10: '
number = gets.chomp.to_i
# Validate input for your requirements
unless (1..10).cover?(number)
raise ValidationException, 'Interger entered is outside specified range.'
end
number
rescue ValidationException => err
# Print exception and retry current method
puts err
retry
end
# Get car name from user input
def car_from_input
print 'Enter name of a car model: '
gets.chomp
end
# Create array with size equal to number from imput and fill it with cars
array_of_cars = Array.new(number_of_cars_from_input) { car_from_input }
# Separate cars in groups by 3 and join groups
puts array_of_cars.each_slice(3).map { |a| a.join(', ') }