Modern calculators

Calculator

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It is a calculator is an instrument for conducting calculations. Modern calculators usually include general-purpose computing systems, but they're usually made to carry out specific tasks. For instance, graphing calculators focus on graph-centered math like trigonometry and statistics. In addition, modern calculators are larger and more portable than a majority of computers although some personal digital aids (PDAs) are comparable in size to hand held calculators.

Since calculators are miniature, one day devices that are as small as credit cards could perform the identical calculations that are currently used in large scientific calculators. Another possibility is similar to a handheld calculator which has notations that are not entered by buttons, but instead written on screen. In this way, the requirement for buttons would be eliminated and the overall size of the device could be further reduced.

Overview

At one time, mechanical clerical aids such as abaci, comptometers and Napier's bones, mathematical books, tables, slide rules, or mechanical adding machines were employed for numeric work. The term "calculator" denoted a person who worked for a living using such aids , as well as papers and pencils. The semi-manual procedure of calculation was time-consuming and error-prone.

Modern calculators are electrically powered and come in various dimensions and shapes, ranging from basic, free, credit-card sized models to more robust adding machines--like models that have integrated printers.

Electronic calculators

In the past, some calculators were as large as those used today. The first mechanical calculators were desktop computers, and were later replaced by electromechanical calculators for desktops, and the electronic calculators were later replaced by first thermionics valves, and then transistors, and finally hard-wired integrated circuit logic. Today, most calculators are hand-held electronic devices.

Basic configuration

The complexity of calculators varies according to the purpose they were designed for. A simple , modern calculator may comprise of the following components:

• A source of power like a battery or solar panel both
• Displays are typically made with LED lights or liquid crystal (LCD), that can display a variety of numbers (typically 8 , 10 or)
• Electronic circuitry
• A keypad with:
  • The ten digitsin ten, 0 through 9
  • The decimal point
  • The equals sign, which is used to ask for the answer
  • The four arithmetic functions (namely subtraction, multiplication and division)
  • The Cancel button will clear the current calculation
  • On and off buttons
  • Other functions that are fundamental include square root or percentage (%).
• Some models with more advanced features may include one-number memory that is able to be used whenever it is needed. It may also include a Cancel Entry button, which will remove the numbers currently entered.

In the last decade, simple calculators have been placed in other small devices including cellphones, pagers, or wrist watches.

Advanced electronic calculators

Advanced scientific calculators can support trigonometric, statistical, and many other math functions. The most sophisticated modern calculators have graphics and also include features from computer algebra systems. They can also be programmed; calculator applications include algebraic equation solvers financial models, as well as even games. Many calculators of this kind will print numbers with up to 10 decimal points or digits with full resolution on the display. Scientific notation is used for notating numbers of up to 9.999999999*10 ⁹⁹. If a higher value or mathematical expression that yields higher numbers than the number entered (a common example comes from entering "100! ", read as "100 factorial") then the calculator will simply display "error."

"Error" is also displayed if a function or an operation is mathematically undefined such as division using zero, or positive numbers' roots (most scientific calculators do not allow complex numbers, though some high-end models do have a special function for working with them). Some, but not most, calculators are able to distinguish between these two types of "error," though when they do, it is not easy for the user to understand because they're usually listed by the numbers "error 1" or "error 2."

A few companies create and manufacture the latest financial and engineering calculators for professionals the most well-known ones are Casio, Sharp, Hewlett-Packard (HP) as well as Texas Instruments (TI). Such calculators are good illustrations of embedded computers.