How calculator works..
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Yes, calculators are computers, but can do only certain computations. Whereas a PC can compute anything that is computable (ignoring time constraints).
Suppose your enter 2 + 3 into your calculator. The calculator is programmed to convert the numbers into binary, and to recognize that when you hit the + key, you want to add them.
It then adds these numbers with its built in hardware, usually called a binary adder. This will give the answer in binary.
Then it uses other hardware to convert to base 10 and then display the answer so humans can read it.
It's actually quite a bit of work. But if it can do a million operations a second, it seems instantaneous to us.
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