exact squares

exact_squares.rb

# A program that takes any single number (max) and returns all the numbers below (max) that is an exact square

def exact_squares(max)
  s = []

  while max > 0
    s << max if is_exact_square? max 
    max -= 1
  end

  s
end

def is_exact_square?(max)
  sqr = Math.sqrt max
  sqr == sqr.to_i
end

p exact_squares(200)

def prog(max)
results = .each do |x|
results << x if is_valid?(x)
end
results
end

def is_valid?(num)
((num % 5) == 0 || (num % 2) == 0) && ((num % 5) != 0 || (num % 2) != 0)
end