Basics of Elixir

Conversion of old BASIC programs to Elixir in order to learn the basics of this language.

Tags:

Diamond

# Diamond

# Original version in BASIC:
#     Example included in Vintage BASIC 1.0.3.
#     http://www.vintage-basic.net

# This version in Elixir:
#     Copyright (c) 2026, Marcos Cruz (programandala.net)
#     SPDX-License-Identifier: Fair
#
# Written on 2026-01-13
#
# Last modified: 20260113T2101+0100.

defmodule Diamond do

  def lines do
    17
  end

  defp print_char(number, max_number, char) do
    if number == max_number do
      :ok
    else
      IO.write(char)
      print_char(number + 1, max_number, char)
    end
  end

  def print_top_line(line, max_line) do
    if line == max_line do
      :ok
    else
      print_char(1, div((Diamond.lines + 1), 2) - line + 2, " ")
      print_char(1, line * 2, "*")
      IO.puts("")
      print_top_line(line + 1, max_line)
    end
  end

  def print_bottom_line(line, max_line) do
    if line == max_line do
      :ok
    else
      print_char(1, line + 2, " ")
      print_char(1, (div((Diamond.lines + 1), 2) - line) * 2, "*")
      IO.puts("")
      print_bottom_line(line + 1, max_line)
    end
  end

end

Diamond.print_top_line(1, div(Diamond.lines, 2) + 2)
Diamond.print_bottom_line(1, div(Diamond.lines, 2) + 1)

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Elixir

Basics of Elixir

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Diamond

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