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2. Calculator input methods - Wikipedia

   en.wikipedia.org/wiki/Calculator_input_methods

   Problems can occur because, for anything but the simplest calculation, in order to work out the value of a written formula, the user of a button-operated calculator is required to: Rearrange the formula so that the value can be calculated by pressing buttons one at a time, while taking operator precedence and parentheses into account.

3. Keypad - Wikipedia

   en.wikipedia.org/wiki/Keypad

   A keypad is a block or pad of buttons set with an arrangement of digits, symbols, or alphabetical letters. Pads mostly containing numbers and used with computers are numeric keypads . Keypads are found on devices which require mainly numeric input such as calculators , television remotes , push-button telephones , vending machines , ATMs ...

4. TI-30 - Wikipedia

   en.wikipedia.org/wiki/TI-30

   On these early models, pressing "0 INV TAN" (tan −1 (0) on today's models (TI-30X Plus MathPrint)) would cause the calculator to go into an infinite loop until it is powered off with the OFF button. The "0" had to be pressed on the keyboard; the calculator produced a correct answer if the "0" was the result of a previous calculation.

5. Windows Calculator - Wikipedia

   en.wikipedia.org/wiki/Windows_Calculator

   A simple arithmetic calculator was first included with Windows 1.0. [5]In Windows 3.0, a scientific mode was added, which included exponents and roots, logarithms, factorial-based functions, trigonometry (supports radian, degree and gradians angles), base conversions (2, 8, 10, 16), logic operations, statistical functions such as single variable statistics and linear regression.

6. Template:Calculator button - Wikipedia

   en.wikipedia.org/wiki/Template:Calculator_button

   Create a button element that can affect a widget from Template:Calculator Template parameters [Edit template data] Parameter Description Type Status for for id of Calculator field that is the target of this button String required formula formula Formula to set the field from the for parameter to Example x+1 String required contents contents 1 Contents of the button Example Click here Content ...

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8. Mechanical calculator - Wikipedia

   en.wikipedia.org/wiki/Mechanical_calculator

   The comptometer-type calculator was the first machine to receive an all-electronic calculator engine in 1961 (the ANITA mark VII released by Sumlock comptometer of the UK). In 1890 W. T. Odhner got the rights to manufacture his calculator back from Königsberger & C , which had held them since it was first patented in 1878, but had not really ...

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