Calculator-VI
The first desktop programmable calculators were produced in the mid-1960s. They included the Mathatronics Mathatron (1964) and the Olivetti Programma 101 (late 1965) which were solid-state, desktop, printing, floating point, algebraic entry, programmable, stored-program electronic calculators. Both could be programmed by the end user and print out their results. The Programma 101 saw much wider distribution and had the added feature of offline storage of programs via magnetic cards. Find more on wikipedia page...
In this series of missions you are going to build an elementary calculator.
As an input, you get a sequence of keys pressed, and, as the result of that function, you...
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