Making the Calculator More General with a “Little Language”
You need to make a little change to the user interface of the calculator, to make it more “testable.”
User Interface
 | The part of the program that sends output to the user and gets input from the user. |
Instead of prompting users to input numbers or indicate that they want to stop, the program will now get commands from a “little language.” These commands will be typed into the running program when it needs input—just as you type on your handheld calculator.
A statement in this language has the following form:
<operator><operand>
<operator> can be any of the following:
+ to add the operand ...
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