The calculator generally refers to an electronic calculator. It is a small handheld electronic calculatory appliance, which is mainly used to complete simple mathematical computing.It has a weak function, usually can only complete arithmetic operations and a small amount of logical operations and display its results.It is usually used in business transactions or as a student computing, and is one of the common office stationery.
Introduction to calculator
The calculator is an electronic machine invented by modern people to perform digital operations.
Modern electronic calculators can perform electronic machines that can perform mathematical computing. They have integrated circuit chips, but the structure is much simpler than a computer. It can be said to be the first generation of electronic computers (computers).Cheap, can be widely used in commercial transactions, is one of the necessary office supplies.In addition to displaying the calculation results, there are often overflow instructions, error instructions, etc.The calculator power supply adopts an AC converter or battery, and the battery can be charged with an AC converter or a solar converter.In order to save power, the calculator uses a large -scale integrated circuit made by CMOS technology.
Calculator classification
Physical calculator:
Such calculators are generally handheld calculators, which are easy to carry and easy to use. However, in general, the function is simpler, and it is not convenient to upgrade the function.There are also powerful graphics handheld calculators in the small part of the ministry, but because the price is the most expensive, it is not recommended to buy the most expensive multifunctional handheld calculators when the popularity of tablets and smartphones is popular.
Software form calculator:
Such calculators exist in software and can be used on PC computers or smartphones and tablets.This type of calculator has many functions, and the functions can be expanded through software upgrades.With the popularity of tablets and smartphones, more and more calculators in software forms will be applied. In the end, it is expected to replace traditional handheld calculators.Software form calculations can generally be divided into three categories: common calculators, special calculators, and comprehensive functional calculators.
How to use calculators
1. When you type the number, press the corresponding number key. If you press the wrong (CE) key to remove the value once, and then re -enter the correct number.
2. After entering the number directly, press the multiplication number to turn it to the multiplier. Press the (=) key directly without entering the number of multiplied.
3. The root number (√) key is to open the secondary root by default. Only a scientific calculator can open multiple square roots.
4. Press the (+/-) key to change the positive and negative value of the number.
5. After entering the number and determining the operation symbol, press the (%) key to automatically assign the previous parameter to the parameter of the previous parameter to participate in the operation.The percentage of Windows 7 cannot directly participate in the operation. Participating in the operation is the number of percentage of the previous operation.
6. Some standard types have digital storage functions, including four keys: MRC, M-, M+, MU.After typing the numbers, press M+to read the number into the memory. No matter how much step operation is performed, just press MRC to read the previously stored numbers. Press M-to delete the number from the memory, or press the second MRC for the second MRCEssence
7. The equal number "*=" can also indicate the square: such as 10 square meters, you can press 10 and then press × and then press = the result will be 100.However, press 10,++and then = the result to 20, that is, "+= indicate twice, because it is equivalent to 10+10 = 20. Similarly 10/=, equivalent to pressing 10/10 =, the result is 1.