![]() Some smartphone calcs show operands in vertical lines, and clear the screen when you press reset. ![]() ![]() For example the Win7 calc shows you prior operands. Plus, many of us have gotten burned by starting a new calculation while the calculator was still in another mode, and gotten a totally unpredicted result. In many calculators, if you see a zero on the screen, you have no idea if the calculator is in the middle of an operation or not. Other answerers have provided great logical reasons for how these habits could come about, but I think it is simpler than that (plus, how often are any of us logical?).Ĭalculators obviously have a state, since they do multi-step operations, but they don't clearly show their state. ![]()
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