Well the modern calculator with circuits was invented by William Seward Burroughs, while the first calculator (slide and rule) was invented by W. Oughtred (1574-1660).
Nobody "discovered" the calculator in the contemporary sense. It was a natural outgrowth of continuous integrated circuit miniaturization.
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A Texas Instruments graphing calculator can be used as a basic calculator, a scientific calculator and a graphing calculator.
pocket calculator is a calculator that we keep in our pocket
fitness calculator
On normal calculator, press 'Off'. If your calculator doesn't have this button, the calculator will turn off automatically after some time. On scientific calculator, press 'shift' and press 'AC'. (depends on your version of the calculator)
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