From 6b719a37e3cb6c4f91f9269ea2652c1d74f61bff Mon Sep 17 00:00:00 2001
From: Slavasil <subvia@proton.me>
Date: Tue, 24 Mar 2026 15:48:18 +0300
Subject: [PATCH] add demonstration

---
 bin/demo | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100755 bin/demo

diff --git a/bin/demo b/bin/demo
new file mode 100755
index 0000000..4f0f08a
--- /dev/null
+++ b/bin/demo
@@ -0,0 +1,24 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require 'bundler/setup'
+require 'ruby_algebra'
+
+puts 'RubyMaple © RubyMaple Creators, 2026. No rights reserved.'
+
+loop do
+  puts 'Введите формулу (пустая строка для выхода): '
+  inp = $stdin.gets.chomp
+  exit if inp.empty?
+  begin
+    formula = RubyAlgebra::Parser.parse(inp)
+  rescue StandardError
+    puts 'Ошибка синтаксиса'
+  end
+  puts "Формула: #{formula}"
+  puts "Производная по x: #{formula.diff('x')}"
+  puts "Производная по y: #{formula.diff('y')}"
+
+  value = formula.evaluate
+  puts "Числовое значение: #{value}" unless value.nil?
+end