Please join John Bremer and the LiftedViz interns as we show off our team project building a calculator in Tableau Public.  This is a great way to get a better understanding of how to program in Tableau.  We'll build the source data for a classic calculator face, and then we'll add a Parameter and Parameter Action to save each clicked value.  Next we'll add a Calculated Field and another Parameter to keep track of all the clicked-on numbers and operators in order to build up the expression we want to evaluate, e.g., "56+47".  And finally we'll use another Parameter and Parameter Action along with Regular Expressions in a calculated field to evaluate the expression we've built up and return the total!