16 Facts About Pocket calculators

For example, there are scientific Pocket calculators which include trigonometric and statistical calculations.

Graphing Pocket calculators can be used to graph functions defined on the real line, or higher-dimensional Euclidean space.

Electronic Pocket calculators contain a keyboard with buttons for digits and arithmetical operations; some even contain "00" and "000" buttons to make larger or smaller numbers easier to enter.

Also, some fractions can be difficult to recognize in decimal form; as a result, many scientific Pocket calculators are able to work in vulgar fractions or mixed numbers.

Power sources of Pocket calculators are batteries, solar cells or mains electricity, turning on with a switch or button.

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Where Pocket calculators have added functions, software algorithms are required to produce high precision results.

The distinction is not clear-cut: some devices classed as programmable Pocket calculators have programming functions, sometimes with support for programming languages .

The early Pocket calculators used hundreds of germanium transistors, which were cheaper than silicon transistors, on multiple circuit boards.

One of the first low-cost Pocket calculators was the Sinclair Cambridge, launched in August 1973.

The Sinclair Pocket calculators were successful because they were far cheaper than the competition; however, their design led to slow and inaccurate computations of transcendental functions.

The $395 HP-35, along with nearly all later HP engineering Pocket calculators, uses reverse Polish notation, called postfix notation.

The error messages on those Pocket calculators appear as a Russian word "YEGGOG" which, unsurprisingly, is translated to "Error".

Many Pocket calculators continued to use two or more ICs, especially the scientific and the programmable ones, into the late 1970s.

At the start of the 1970s, hand-held electronic Pocket calculators were very costly, at two or three weeks' wages, and so were a luxury item.

However, the cost of Pocket calculators fell as components and their production methods improved, and the effect of economies of scale was felt.

However, CI's more successful Pocket calculators involved a line of construction Pocket calculators, which evolved and expanded in the 1990s to present.