Modern electronic calculators are small (often pocket-sized), digital, and usually inexpensive devices to perform the basic operations of arithmetic. In addition to general purpose calculators, there are those designed for specific markets; for example, there are scientific calculators A scientific calculator is a type of electronic calculator, usually but not always handheld, designed to calculate problems in science , engineering, and mathematics. They have almost completely replaced slide rules in almost all traditional applications, and are widely used in both education and professional settings which focus on operations slightly more complex than those specific to arithmetic - for instance, trigonometric Trigonometry is a branch of mathematics that studies triangles, particularly right triangles. Trigonometry deals with relationships between the sides and the angles of triangles and with the trigonometric functions, which describe those relationships, as well as describing angles in general and the motion of waves such as sound and light waves and statistical Statistics is the science of making effective use of numerical data relating to groups of individuals or experiments. It deals with all aspects of this, including not only the collection, analysis and interpretation of such data, but also the planning of the collection of data, in terms of the design of surveys and experiments calculations. Some calculators even have the ability to do computer algebra A computer algebra system is a software program that facilitates symbolic mathematics. The core functionality of a CAS is manipulation of mathematical expressions in symbolic form. Graphing calculators A graphing calculator typically refers to a class of handheld calculators that are capable of plotting graphs, solving simultaneous equations, and performing numerous other tasks with variables. Most popular graphing calculators are also programmable, allowing the user to create customized programs, typically for scientific/engineering and can be used to graph functions defined on the real line, or higher dimensional Euclidean space In mathematics, Euclidean space is the Euclidean plane and three-dimensional space of Euclidean geometry, as well as the generalizations of these notions to higher dimensions. The term “Euclidean” is used to distinguish these spaces from the curved spaces of non-Euclidean geometry and Einstein's general theory of relativity. They often serve other purposes, however. Modern calculators are more portable than most computers, though most PDAs A personal digital assistant is a mobile device, also known as a palmtop computer. PDAs are used to organize a person's life by taking notes, holding contacts, and connecting to the Internet. Newer PDAs commonly have color screens and audio capabilities, enabling them to be used as mobile phones (smartphones), web browsers, or portable media are comparable in size to handheld calculators.
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