basic computer programs

less fun. But it rarely works. it is not object-oriented or has any defects. But object-oriented is not the basic atom of computer programming, they do not exist naturally as people imagine. Using object-oriented to solve the problem without a threshold will make the code bloated and over-Technical. However, many people insist on persistently using objects to solve all the problems. This is terrible beca

Basic knowledge: Fast query of Computer Network Data This article provides several basic information about computer networks, including ASCII code table (octal, decimal, and hexadecimal), IP address classification, private IP address, and Ethernet frame construction. 1. ASCII code table (octal, hexadecimal)

: Network Disk DownloadVolume 1th introduces the basic concepts and techniques of programming, and then explains in detail the content of information structure, including the representation of information inside the computer, the structure relationship between data elements, and the effective information processing methods. In addition, the book also describes the programming in the simulation, numerical me

do subtraction, the original code to calculate the negative 0;"Bitwise operator"1, bitwise operatorsA binary calculation; applied only to an integral type.1) Bitwise AND: 94=0, with 1 The result is 1, 0 result is 0; any cardinality and 1 are 1; even and 1 are 0;2) | The bitwise OR 1 is 1, the same 0 is 0;3) ~ 1 0,0 change to 1;4) ^ Bitwise XOR or Same as 0, different 15) >> Right shift each binary all right shift n bit, low drop, high 0, equivalent to the original number/2^n;6) 2, Practical:An

1. A process in a system shares CPU and primary memory resources with other processes. 2. Virtual Memory (Virtual Memory) is a complete interaction between hardware exceptions, hardware address translation, primary storage, disk files, and kernel software, it provides a large, consistent, private address space for each process. With a clear mechanism, virtual memory provides three capabilities that require heavy weight: it regards primary storage as a high-speed cache of the address spa

necessary to find the hardware address of a router on the local area network through ARP, and then send the packet to this router so that the router forwards the packet to the next network. The rest of the work is done by the next network. the resolution from the IP address to the hardware address is automatic, and the user of the host is unaware of this address resolution process. The ARP protocol automatically resolves the IP address to the hardware address required by the link layer as long

Recently saw a lot of people in the game or open the software when prompted "XXXX Microsoft Basic class application has stopped working" this is mostly related to compatibility, the following small series for everyone to share under the several solutions to this situation, I hope to help. Method one; 1, right click on the program shortcut, in the menu bar select the "Properties" option 2, in the Pop-up Properties dialog box, click the a

Installation required-basic hardware knowledge! 　　It is undeniable that although the installation is quite simple, if you lack some basic knowledge, you may encounter many difficulties and even cause irreparable hardware damage. 1.Problems with PC accessories Before installation, We must purchase various accessories one by one. However, these accessories must be used in an organic manner. Specifically, you

values, each of which is called an element, can be any data type, can be a string, a number, or a sub-list. Used to hold multiple values.List creation: list_test=[' LHF ', ' OK 'OrList_test=list (' abc ')OrList_test=list ([' LHF ', ' OK ')Common actions for lists: IndexSlice Append append Overall add to original list go to u Delete Pop length Len slices Loops contains in inserting insertList of other actions: Index lookupCount Statistics numberExtend extensionRemove remov

is f (x,y) = 0 for points on the Circle, and F (x,y) >0 for dots outside of the circle, for Point F (x,y) D=f (M) =f (xp+1,yp-0.5) = (xp+1) hydrate (yp-0.5) 2-R2If the dD=f (xp+2,yp-0.5) = (xp+2) (yp-0.5) 2-r2=d+2xp+3If the d≥0, then should take P2 for the next pixel, and the next pixel discriminant isD=f (xp+2,yp-1.5) = (xp+2) hydrate (yp-1.5) 2-r2=d+2 (XP-YP) +5The first pixel we're talking about here is (0,r), and the initial value of discriminant D is:D0=f (1,r-0.5) =1.25-r "Algorithm Flowc

. Establish Connection Agreement (three handshake)(1) The client sends a TCP message with a SYN flag to the server. This is the message 1 in the three-time handshake process.(2) server-side response client, this is the 2nd message in the three-time handshake, this message with both an ACK flag and a SYN flag. So it represents the response to the client's SYN message, and it also flags the SYN to the client and asks the client if it is ready for data communication.(3) The customer must again resp

You may not check the compilation principles. This course has a lot of theoretical content, and it won't be very rewarding after you finish it. However, if there is time for the data structure, you should take a look at it. It is best to look at the source code of the Java Collection class. I think a computer major student, who has read the JDK source code, will probably not exceed 5%. I asked you to read the source code not because all

First, the basic course of computer networkDescription: The duration of each tutorial is approximately 6 minutes, problem-oriented, project-driven.1, the first chapter IPV4 address introduction http://www.ruijie.com.cn/fw/zxpx/4092, chapter II TCP/IP protocol cluster Introduction http://www.ruijie.com.cn/fw/zxpx/4103. Chapter III ARP protocol working principle http://www.ruijie.com.cn/fw/zxpx/4114, the four

Processor Architecture ISA One processor supportsCommandAndByte encoding of commandsCalled itsInstruction Set architecture ISA. Although the performance and complexity of the processors manufactured by each vendor are constantly improved, different models are compatible at the ISA level. Therefore, ISA providesConcept Abstraction Layer. This concept abstraction layer is the ISA model: the instruction set encoding allowed by the CPU, and commands are executed in sequence, that is, an instruction

phase-by "and", if the result matches the destination network address of the line, the packet is routed to the next-hop router indicated by the row, otherwise, execution (5).(5) If there is a default route in the routing table, the packet is routed to the default router indicated in the routing table; otherwise, it is executed (6).(6) Error reporting forwarding packet.The routing table is known in the Internet and router R1. Host H1 sends a grouping to H2. Try to discuss the process of finding

1. Data link and frame.(1) A link is a physical line between two adjacent nodes . When data needs to be transmitted on a single line, some communication protocols are needed to control the data, and the hardware and software that implement these protocols are combined with the physical lines to form the data link. The way to do this is for example a network adapter.(2) frame is when the network layer down the IP datagram, the data link layer to the IP datagram encapsulation, that is, plus the h

Port concept: in network technology, Port has two meanings: one is physical Port, for example, ADSL Modem, Hub, switch, router is used to connect interfaces of other network equipment, such as RJ-45 port, SC port and so on. The second is the logical port, which generally refers to the port in the TCP/IP protocol. The port number ranges from 0 to 65535, for example, port 80 used to browse Web Services, port 21 for the FTP service. This article mainly summarizes the TCP/IP ports that are commonly

1. IntroductionWhat is a digital system?A digital system (or digital system) defines how a number is represented by a unique symbol.There are two types of digital systems: positional digital systems and non-positional digital systems.2. Position Digital SystemIn a positional digital system, the position that the symbol occupies in a number determines the value it represents.(1) Decimal System① integer② Real numbers(2) binary system① integer② Real numbers(3) Hex system① integer② Real numbers(4) O

I: Ii. Source Code Using system; using system. collections. generic; using system. LINQ; using system. text; using system. windows; using system. windows. controls; using system. windows. data; using system. windows. documents; using system. windows. input; using system. windows. media; using system. windows. media. imaging; using system. windows. navigation; using system. windows. shapes; using system. diagnostics; using system. runtime. interopservices; one-click lock for namespace shutdown {/

CPU and installed memory are unavailable in basic computer information, as shown below:Cause analysis:This problem occurs because the Windows Management Instrumentation Service is disabled.Solution:Enable the Windows Management Instrumentation Service and set the startup type to automatic.Note: If an error is reported, try to import the registry file in the attachment to the user system.