Computers generally refer to electronic computers (electronic computers used for high-speed calculation), which can perform numerical calculation and logical calculation, have storage and memory functions, run according to programs, and automatically and high-speed process massive data. The electronic computer is developed from the early electronic calculator.
Calculator is an electronic machine invented by modern people that can perform digital operations. Its complete function is to process all kinds of data, such as four arithmetic operations, and, or, and non-logical operations, arithmetic and logical shift operations, numerical comparison, sign transformation, calculation of main memory address and so on.
Calculator is generally composed of arithmetic unit, controller, memory, keyboard, display, power supply and some optional peripheral devices and electronic accessories, and is composed of manual or mechanical equipment.
Modern development
Early calculators were purely manual, such as abacus and calculation. An abacus is usually made of sliding beads. In the west, abacus had been used for centuries before the popularity of Indian Arabic numerals, and it was still widely used in accounting and business in modern China. Then came the mechanical calculator.
/kloc-At the beginning of the 0/7th century, the computing tools in western countries developed greatly. Napier, an English mathematician, invented Napier Arithmetic, and Orchard, an English priest, invented the cylindrical logarithmic ruler. This ruler can not only do addition, subtraction, multiplication, division, square and root, but also calculate trigonometric function, exponential function and logarithmic function. These calculation tools not only promote the development of calculators, but also lay a good foundation for the development of modern calculators.