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A Calculator Online

A Calculator Online

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You will also notice some differences in how addition, subtraction, multiplication, and division keys appear. Once you bring up the calculator function, there is often a circle or square to give you the operations which you perform using the Menu button on the phone. Always put a number in to start and then you can add, subtract, multiply, or divide. A few phones have other operations available, but usually they are available as a download and are quite expensive compared to purchasing a calculator. For instance, instead of a hardware multiplier, a calculator might implement floating point mathematics with code in read-only memory (ROM), and compute trigonometric functions with the CORDIC algorithm because CORDIC does not require much multiplication. Bit serial logic designs are more common in calculators whereas bit parallel designs dominate general-purpose computers, because a bit serial design minimizes chip complexity, but takes many more clock cycles. This distinction blurs with high-end calculators, which use processor chips associated with computer and embedded systems design, more so the Z80, MC68000, and ARM architectures, and some custom designs specialized for the calculator market

The calculator is a tool to do calculations just as the human mind and paper and pencil are tools. There are many times when mental computing (or even paper & pencil) are more effective or appropriate. For example, adding single digits is done much more quickly using mental math (in your mind) than by punching every number and operation into the calculator. Choosing the right 'tool' is part of effective problem-solving process.Most pocket calculators do all their calculations in binary-coded decimal (BCD) rather than binary. BCD is common in electronic systems where a numeric value is to be displayed, especially in systems consisting solely of digital logic, and not containing a microprocessor. By employing BCD, the manipulation of numerical data for display can be greatly simplified by treating each digit as a separate single sub-circuit. This matches much more closely the physical reality of display hardware—a designer might choose to use a series of separate identical seven-segment displays to build a metering circuit, for example. If the numeric quantity were stored and manipulated as pure binary, interfacing to such a display would require complex circuitry. Therefore, in cases where the calculations are relatively simple, working throughout with BCD can lead to a simpler overall system than converting to and from binary. (For example, CDs keep the track number in BCD, limiting them to 99 tracks.) (Source: en.wikipedia.org)

 

 

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