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  2. Calculator input methods - Wikipedia

    en.wikipedia.org/wiki/Calculator_input_methods

    Calculator input methods. There are various ways in which calculators interpret keystrokes. These can be categorized into two main types: On a single-step or immediate-execution calculator, the user presses a key for each operation, calculating all the intermediate results, before the final value is shown. [1] [2] [3]

  3. Timesheet - Wikipedia

    en.wikipedia.org/wiki/Timesheet

    Timesheet. A timesheet (or time sheet) is a method for recording the amount of a worker's time spent on each job. Traditionally a sheet of paper with the data arranged in tabular format, a timesheet is now often a digital document or spreadsheet. The time cards stamped by time clocks can serve as a timesheet or provide the data to fill one.

  4. Reverse Polish notation - Wikipedia

    en.wikipedia.org/wiki/Reverse_Polish_notation

    By this time, HP was the leading manufacturer of calculators for professionals, including engineers and accountants. Later calculators with LCDs in the early 1980s, such as the HP-10C , HP-11C , HP-15C , HP-16C , and the financial HP-12C calculator also used reverse Polish notation.

  5. HP calculators - Wikipedia

    en.wikipedia.org/wiki/HP_calculators

    Smaller programmable model with programs up to 49 steps. Version HP-25C was first calculator with "continuous memory". HP-27S: 1988 The first HP pocket calculator to use algebraic notation only rather than RPN. It was a "do all" calculator that included algebraic solver like the HP-18C, statistical, probability and time/value of money ...

  6. Ovulation Calculator & Calendar - Determine Your Most Fertile ...

    www.webmd.com/baby/healthtool-ovulation-calculator

    Ovulation usually happens 14 days before your next period begins, but it can vary from month to month -- even in women with regular cycles. To get a better sense of when you’re ovulating, chart ...

  7. HP-12C - Wikipedia

    en.wikipedia.org/wiki/HP-12C

    Power consumption. 0.25 mW. Weight. 113 g. Dimensions. 128 × 79 × 15 mm. The HP-12C is a financial calculator made by Hewlett-Packard (HP) and its successor HP Inc. as part of the HP Voyager series, introduced in 1981. It is HP's longest and best-selling product and is considered the de facto standard among financial professionals.

  8. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    By 1970, a calculator could be made using just a few chips of low power consumption, allowing portable models powered from rechargeable batteries. The first handheld calculator was a 1967 prototype called Cal Tech, whose development was led by Jack Kilby at Texas Instruments in a research project to produce a portable calculator. It could add ...

  9. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    t. e. ISO 8601 is an international standard covering the worldwide exchange and communication of date and time -related data. It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]

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