mechanical digital calculator

calculator Use in education

A student with a calculator.

In most developed countries, students use calculators for schoolwork. There was some initial resistance from the concept due to worry that the fundamental arithmetic abilities might be diminished. There's still some disagreement on the importance of the ability to perform calculations by hand and "in the head," while some courses restrict calculator usage until a certain degree of proficiency is reached some focusing upon teaching estimation skills and solving problems.

There are additional concerns, for example there is the possibility that a child could utilize the calculator in the wrong fashion but still believe it was the result reported by the calculator. Teachers attempt to prevent this by encouraging students to estimate the result manually and ensuring it's roughly in line with what is the calculatedresult. It is also possible for a child to type in 1 x 1 and then get the correct answer 1 and not be aware of the fundamentals involved. In this sense the calculator is more of a crutch than a tool for learning and can cause a slowdown for students during exams as they check even the most insignificant results using the calculator.

Other concerns about the use

Errors do not only affect students in schools. Anyone could blindly trust the calculator's output without double-checking the significance of the result--i.e. which decimal point is positioned. This problem was not present in the days of pencil-and-paper calculations, when the task to determine the magnitudes of result had to be carried out on the part of the person using the calculator.

Certain fractions, for example, 2/3, are not quite easy to display on a calculator display, since they are generally rounded to 0.66666667. Additionally, certain fractions like 0.14285714... might be difficult to discern in decimal form--in fact this is a number of 1/7. Some of the most advanced scientific calculators can operate with vulgar fractions, however, the process in actual use is somewhat awkward.Basic calculator

Calculators vs. computing

A fundamental difference between calculators and the majority of computers is that calculators are only numeric tools however computers can make use of numbers to manipulate images, words, or even sounds, like.

It is true that the market of calculators is extremely price-sensitive. typically , the buyer is concerned about what is the least expensive calculator with a particular list of features, and does not care much about speed (since speed is primarily constrained by the speed at that the user can use the controls). Therefore, the makers of calculators try to reduce how many logic components on the chip, and not the amount of clock cycles required for a calculation.

In this case, instead of an actual multiplier in hardware for example, a calculator might implement floating point mathematics with code in memory, and then compute trigonometric operations using the CORDIC algorithm, as CORDIC does not require floating-point. Similar to this, bit-serial design patterns are more frequent in calculators however bit-parallel designs dominate general-purpose computing: A bit-serial design minimizes the chip complexity but requires more clock cycles.

Personal computers and digital assistants can perform general calculations in many ways:

• Many applications are designed to carry out calculations, ranging from simple calculator emulators, through scientific calculators like Microsoft Calculator, to advanced spreadsheet programs such as Excel and OpenOffice.org Calc.
• Computer algebra software programs such as Mathematica, Maple, or Matlab are capable of handling complex calculations.
• Client-side scripting can be used for calculations, e.g. by entering "javascript:alert(calculation written in Javascript)" in a web browser's address bar (as opposed to "http://website name"). The calculations may be included in a separate Javascript or HTML file, as well.
• Online calculators such as one of the calculator feature of the Google search engine can perform calculations server-side.