gistfile1.txt

def main 
  if ARGV.length < 2
          STDERR << "Usage: #{$0} <a> <b> <c>\n"
          exit 1
  end

  a = ARGV[0].to_f
  b = ARGV[1].to_f
  c = ARGV[2].to_f

  is_quadratic =  (ARGV.length>2)
  if is_quadratic
    solve_quadratic(a,b,c)
  else
    solve_linear(a,b)
  end
end

def  solve_quadratic(a,b,c)
  
  if a == 0
    STDERR << "<a> should not be zero\n" 
    exit 1
  end
  
  disc = b**2 - 4*a*c
  d_str = (disc >= 0) ? (Math.sqrt(disc) % 1 == 0) ? Math.sqrt(disc).to_i : "√#{disc}" : "√#{disc}"

  s = "#{-b} ± #{d_str}"
  d = "#{2*a}"
  puts "\e[4m#{s}\e[0m"
  #puts "─"*(s.length)
  puts d.center s.length
end

def  solve_linear(a,b)
  puts "#{-b/a}"
end

main