mikecm1141 / rpn-calculator

Explanation: In Reverse Polish Notation (RPN) the operators follow their operands; for instance, to add three and four one would write 3 4 + rather then 3 + 4. If there are multiple orperations, the operator is given immediately after its second operand; so the expression written 3 - 4 + 5 in conventional infix notation would be written 3 4 - 5 + in RPN: first subtract 4 from 3, then add 5 to that.

Example: The infix expression 5 + ((1 + 2) * 4) - 3 can be written down like this in RPN: 5 1 2 + 4 * + 3 -

Instructions: Your calculator should handle:

• At least 4 numbers

• The four basic arithemetic operations +, -, *, /.

• Use standard in and standard out to accept and return data. Entering q should quit the application.

Sample:
1
2
+
= 3
2
*
= 6
4
-
= 2
q
goodbye

Requirements

This project was developed for Ruby 2.5 or above.

Setup

bundle install

Test Suite

This project uses RSpec for its testing framework. Run rspec in project root directory to run the full test suite.

Running the Calculator

Run rake rpncalc to start the Calculator CLI.