How to use the application:

1. Check if node.js is installed.
2. Open Terminal an navigate to application folder.
3. Type "node server.js" to start the server.
4. Open a second Terminal window.
5. Type "node client.js operand1 operator operand2".

operand1 and operand2 have do be an Integer.

operator has to be '+'. '-', 'x' or '/' according to, what you want to calculate.