basic computer programs

together, may write less code, but if the use of improper, will make the understanding much more difficult.Operator PrecedenceA slightly more complex operation may involve multiple variables, and a number of operations, which is the first, which is the calculation? The programming language dictates the precedence of the different operators, some will be counted first, some will be counted later, and in most cases, this priority is consistent with our common sense understanding.But in some compl

, the whole process is called context switching, which is not only time consuming, but also invalidates many caches in the CPU, which is a cost.Of course, these costs are relatively relative, and these costs are acceptable if the threads actually do a lot of things, but if you just perform the counter++ in the example in this section, that would be too expensive.In addition, if the tasks performed are CPU intensive, that is, the CPU is mostly consumed, it is unnecessary to create a thread that e

shared by all processes. The properties of the file are mostly saved.For the above program, there are two open file tables, each file table holds the location of open files, they are independent of each other, so in the last read, read a.Of course we don't use these system-level functions most of the time when we write programs, and we've already developed a set of standard IO functions for us to use, such as Printf,fopen,fread.The communication and

Thinking logic of computer programs Thinking logic of computer programs (1)-data and variables Thinking logic of computer programs (2)-assignment Thinking logic of computer

Thinking logic of computer programs (26) and thinking 26 Packaging Java has eight basic types, each of which has a corresponding packaging class. What is the packaging class? It is a class that contains an instance variable and stores the value of the corresponding basic type. This class generally has some static metho

learn more, you can view the Hacker's Delight book based on the notes. We also introduced the implementation of valueOf and the metadata sharing mode. Next, let's discuss Character. ---------------- For more information, see the latest article. Please pay attention to the Public Account "lauma says programming" (scan the QR code below), from entry to advanced, ma and you explore the essence of Java programming and computer technology. Write with your

Thinking logic of computer programs (24) and thinking Logic The basic types, classes, interfaces, and enumerations we introduced previously are all used to represent and operate data. There may be many errors during the operation process, and there may be many causes of errors, some are uncontrollable internal reasons, such as insufficient memory, full disk, and

Thinking logic of computer programs (23) and thinking 23 In the previous series, we introduced the basic data types, classes, and interfaces used to represent and operate data in Java. This section discusses enumeration types in Java. Enumeration is a special type of data. Its values are limited and can be enumerated. For example, a year has four seasons and a we

Thinking logic of computer programs (29) and thinking 29 This section describes the Character encapsulation class Character. String operations are probably the most common operations in computer programs. Java indicates that the String class is String. This section describes String in detail. The

I. Basic concepts of BIOS When talking about bios, have you been concerned about it? In fact, whenever you press the power key on the chassis, it will really work for you. So what is bios? The book gave us a definition: "BIOS is short for Basic Input-Output System (Basic Input-Output System). It is responsible for initializing, setting, and testing various system

nature of Java programming and computer technology. Write attentively, original articles, and keep all copyrights.-----------More Praise original ArticlesThinking Logic of computer programs (1)-Data and variablesThinking Logic of computer programs (5)-Why do decimal calcula

The procedure is probably going on.The computer is a machine, the machine is mainly composed of CPU, memory, hard disk and input. Computers running on the operating system, such as Windows or Linux, run various applications on the operating system, such as word, QQ, etc.The operating system divides time into a lot of small time slices, a time slice for one program, another time slice for another program, and frequent switching between

Thinking logic of computer programs (19), thinking Logic Restrictions on Data Types Previously, we have been saying that programs mainly involve data and data operations. To facilitate data operations, the advanced language introduces the concept of data types. Java defines eight basic data types, A class is equivalent

What is the basic computer system and what is the basic computer system? What's the operating system? First, we need to know,Why is there an operating system?. A modern computer system consists of one or more processors, primary storage, hard disk, keyboard, mouse, display,

files, pictures, HTML files, compressed files and so on.Finally, for serialization, in addition to introducing the default serialization mechanism for Java, we also introduce XML, JSON, and Messagepack.SummaryThis section describes some of the basic concepts and common sense of files, the basic thinking and class structure of working with files in Java, and finally we summarize the following chapters to ar

table, a tree is also an important data structure and way of thinking in computer programs. To be able to manipulate data quickly, hashes and trees are two basic ways of thinking that do not require order, prioritize hashing, need order, and consider trees. In addition to the container class Treemap/treeset, the index structure in the database is tree-based (but

The previous section describes the wrapper class character for a single character, and this section describes the string class. String manipulation is probably the most common operation in a computer program, and the class that represents the string in Java is string, and this section describes string in detail.The basic use of strings is simpler and more straightforward, let's take a look.Basic usageYou ca

Thinking logic of computer programs (14), thinking Logic It is said that Tao shengyi has a second, second, and third life. If binary representation and operation are regarded as one, the basic data type is regarded as two, and the basic data type is regarded as three, then, the combination of classes and the inheritanc

enumeration types are more concise, secure, and convenient.We've mentioned anomalies before, but we haven't discussed them in depth, let's discuss them in the next section.----------------To be continued, check out the latest articles, please pay attention to the public number "old Horse Programming" (Scan the QR code below), from the introduction to advanced, in layman's words, Lao Ma and you explore the nature of Java programming and computer techn

Thinking logic of computer programs (1), thinking LogicWhat is the program? A computer is a machine that consists of CPU, memory, hard disk, and input/output devices. Operating systems run on the computer, such as Windows or Linux, and various applications, such as Word and QQ, run on the operating system. The operatin