Hi,

This forum is about asking questions about having problems with anything regarding building your Mendix applications. Not asking the community to build the full functionality for you.

If you are asking for a direction to start with, I can suggest you a possible route, but I can’t provide you with an exact step-by-step plan.

A possible route could be adding all the buttons of the calculator to a page. When any of the buttons is pressed, add the corresponding action to a string value. Then you can run this string through an ‘eval()’ javascript function to get the desired output.

Hope this helps!