Principles of Computer Composition Problem 20 of the Full Adder

For example, there are two 4-digit additions, i.e., A0-A3 and B0-B3, and the principle of the full adder is that each of the AI and BI corresponds to the addition, plus the carry signal CI-1 from the low bit, to produce 2 outputs, i.e., Si and CI. For example, 0101+0011 is illustrated by the addition of the second digit (a1=0 and b1=1). Let's look at the addition result of the first bit (a0=1 and b0=1), because there is no carry signal for the first bit, so a0+b0=1+1, the result of this operation is s0=0, c0=1;Looking at the operation of the second digit, a1+b1+c0=0+1+1, the result of this operation is s1=0, c1=1, and so on... The final result is 1000

A and B are both multi-bit binary numbers.

ai refers to the ith digit of the number a, and bi refers to the ith digit of the number b.

For example, if a and b are both 8-bit binary numbers, then.

a+b needs to be decomposed into 8-bit binary numbers and added at the same time, and the i-digit addition is AI+BI, and the result is:

0+0=0(si=0,ci=0)

0+1=1(si=1,ci=0)

1+1=10(si=1,ci=1)

1+0=1(si=1,ci=0)

The carry of the adjacent low is CI-1

Read in a minute. Principles of Computer Composition.

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Level 1: Operational skill level. Assess the basic computer knowledge and basic computer operation ability, including office software, graphics and image software.

Level 2: Programming Advanced application level of office software. The assessment content includes computer language and basic programming ability, and the candidates are required to master a computer language, and the optional categories include high-level language programming, database programming, web programming, etc.; Level 2 also includes advanced application ability of office software, which requires candidates to have computer application knowledge and advanced application ability of MS office office software, and be able to carry out specific applications in the actual office environment.

The division of computer levels is generally divided into starters, the entry-level is the beginner, followed by the mid-range level, and then the professional level, including the professional level of variable programming or painting or audio-visual special effects.

According to the grade, it is divided into 1-4 and so on, and there are relevant courseware and real question banks in the threesome MOOC, and I hope that all students can achieve good results.

Operational skill level, programming senior engineer of office software, preparatory application level, engineer level.

At present, computer majors in China are mainly divided into three categories: basic computer majors, computer majors that intersect with science and engineering, and computer majors that intersect with liberal arts and arts.

1.Fundamentals of Computer Science.

Professional requirements and employment direction: These majors not only require students to master the basic theory of computer science and application development technology, have a certain theoretical foundation, but also require students to have strong practical ability. After graduation, students can be engaged in computer applications and the development and maintenance of computer network systems in enterprises, institutions and departments.

2.Computer science majors that intersect with science and engineering.

There are many computer majors derived from the intersection of science and engineering, such as mathematics and applied mathematics, automation, information and computing science, communication engineering, electronic information engineering, computer application and maintenance, etc.

1) Mathematics and Applied Mathematics

Professional requirements and employment direction: Mathematics and applied mathematics are the foundation and rising platform of computer science, and it is one of the majors most closely related to computer science and technology. This major has a much wider range of employment opportunities than computer science and technology majors, and is suitable not only for the IT field, but also for the mathematics field.

2) Automation Major:

Professional requirements and employment direction: automation major is a wide-caliber major that merges a number of automatic control field majors, requiring students to master the basic theory of automatic control, and based on the emerging application field of information system and information network control to develop a professional curriculum system, which is the core major of industrial manufacturing. Graduates majoring in automation have a strong employment base and advantages.

3) Information and Computing Science:

Professional requirements and employment direction: This is a major formed by the cross-penetration of information science, computational mathematics, operations research and control science, etc., and the employment scope involves teaching, business, network development, software design and other aspects, and the employment rate is as high as more than 95%.

4) Communication Engineering:

Professional requirements and employment direction: The communication engineering major requires students to master the basic theory and basic foundation of communication, master microwave, radio, multi-technology and other communication technologies, as well as electronic and computer technology, and have excellent employment advantages in the information age.

5) Electronic Information Engineering:

Professional requirements and employment direction: Electronic information engineering is a wide-caliber major, mainly to train senior IT talents in the fields of information technology, electronic engineering, network system integration, etc., graduates can be engaged in the research, design, manufacturing, application and development of electronic equipment, information systems and communication systems.

Computer (computer), commonly known as computer, is an electronic computer used for high-speed calculation, which can perform numerical calculations, logical calculations, and also has the function of storage and memory. It is a modern intelligent electronic device that can operate according to the program and process massive amounts of data automatically and at high speed. A computer that consists of a hardware system and a software system without any software installed is called bare metal.

It can be divided into five categories: supercomputers, industrial control computers, network computers, personal computers, and embedded computers, and the more advanced computers include biological computers, photonic computers, quantum computers, etc.

Computers (colloquially known as "computers") are one of the greatest scientific and technological inventions of the 20th century. Its inventor was Johann von Neumann. It is a kind of machine that does not require direct human intervention, and can quickly perform arithmetic and logical operations on various digital information, with a microprocessor as the core, equipped with a large-capacity semiconductor memory and a powerful programmable interface chip, connected to peripherals (including keyboards, monitors, scanners, printers and floppy drives, optical drives and other external memory) and power supply to form a computer, called a microcomputer referred to as a microcomputer or microcomputer, sometimes called a PC (personal computer). ) or mc (micro computer).

The microcomputer plus the system software constitutes the entire microcomputer system (MSC, referred to as the microcomputer system).

Computer (computer

calculation

machine) is an umbrella term that is generally used in academic or formal settings. In common parlance, a computer generally refers to a personal computer used in an electronic computer. A computer is an electronic device that can automatically process and process various data and information according to instructions.

It consists of multiple spare parts, such as processor, motherboard, memory, power supply, graphics card, etc. A device for receiving, processing, and providing data, usually consisting of an input and output device, a memory, an arithmetic and logic component, and a controller; There are three types: analog, digital and hybrid.

The electronic circuits and physical equipment used in computer systems are visible and tangible entities, such as processors (

CPU), memory, external devices (I/O devices), buses, etc.

Memorizer. The main function is to store programs and data, programs are the basis for computer operations, and data is the object of computer operations. Memory is a decoder of memory and address.

It consists of a read/write control circuit, an address bus, and a data bus. The memory that can directly access instructions and data by the processor is called the main memory, and the large-capacity memory such as disks, tapes, and optical disks is called external memory (or auxiliary memory).

A computer's storage system consists of main memory, external memory, and corresponding software.

**The main function of the processor is to perform the operations specified by the program one by one according to the program stored in the memory. The main components of a processor are: data registers, instruction registers, instruction decoders, arithmetic logic components, operating controllers, program counters (instruction address counters.

address registers, etc.

External devices are the bridge between the user and the machine. The task of the input device is to convert the data, characters, words, graphics, programs and other forms of information that the user requires the computer to process into an encoded form that the computer can accept and store in the computer. The task of the output device is to output the processing results of the computer in the form required by the user (such as screen display, text printing, graphics and charts, language sound, etc.).

The input and output interface is a buffer device between the external device and the processor, which is responsible for the matching of electrical performance and the conversion of information formats.

Computer science majors include Computer Science and Technology, Computer Science and Applications, and Network Engineering.

Among them, the computer science and technology major is mainly programming.

Computer Science and Applications is: Learn a lot of computer software usage, how to use it, etc. while network engineering. It's just a simple build**, including some artwork.

There are 9 sub-majors in computer science, namely computer science and technology, software engineering, network engineering, information security, Internet of things engineering, digital technology, intelligent science and technology, spatial information and digital technology, and electronic and computer engineering.

What are the computer science majors?

An electronic computer, commonly known as a computer, is an electronic computing tool. In Chinese mainland, computers are also often used to refer to electronic computers. At present, an electronic computer is a device that processes information according to a pre-set program.

Electronic computers are divided into supercomputers (also known as "supercomputers"), large-scale computers, medium-sized computers, small computers, and microcomputers (referred to as "microcomputers", including personal computers, PCs), which have gradually entered all fields of society, especially into the family and personal fields, and have greatly changed the daily appearance of society.

From the mid-1930s to the late 1940s, many people were developing modern, digital, electronic, general-purpose electronic computers. Many experimental machines have been built and may have been Turing-complete. These machines were all billed as the first electronic computers at the time, but they had limited ability to deal with general-purpose problems, so their designs were eventually abandoned.

The computer was invented in 1946. Around 1940-1942, in the process of developing missiles, there was an urgent need for a tool that could quickly calculate in order to control the flight of missiles. When it deviates from the orbit of the human being, pull it back into orbit.

This results in an electronic computer that calculates the deviation of the missile's trajectory from the predetermined trajectory in a period of 1,100 or 1,100 seconds. Electronic computers do not calculate in the decimal system, but in binary systems. Its appearance is one of the largest contemporary inventions in the world.

The inventor of the first computer was a mathematician named von Noemen.

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At first, the role of the computer was used in the military, and it was invented in order to facilitate the calculation of the ballistics of missiles!

It was born at the University of Pennsylvania in the United States.