Ruby Pascal Traingle

rows = 5

triangle = []

if rows >= 1

triangle.push([1])

end

if rows >= 2

triangle.push([1, 1])

end

last_row = [1, 1]



count = 3

while count <= rows

next_row = [1]

index = 0

while index < last_row.length - 1

next_row.push last_row[index]+last_row[index + 1]

index = index + 1

end

next_row.push(1)

triangle.push(next_row)

last_row = next_row

count = count + 1

end



number_length = last_row[last_row.length / 2].to_s.length

triangle_length = last_row.length * number_length + last_row.length - 1

triangle.each do |row|

final_row = []

row.each do | number|

final_row.push(number.to_s.center(number_length))

end

puts final_row.join(' ').center(triangle_length)

end