Ruby Expression Parser

This program calculates the value of an expression consisting of numbers, arithmetic operators, and parentheses.

Give it a try

$ ruby main.rb
Enter an expression: 2 + 2
=> 4

Type	Name	Latest commit message	Commit time
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	tests
	README.md
	evaluator.rb
	main.rb
	simple_number.rb
	string.rb
	test_simple_number.rb
	tokenizer.rb