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 some are uncontrollable external reasons, suc
Construction and interpretation of computer programs (2nd)
[Original title] structure and interpretation of computer programs, Second Edition[Original Publishing House] mascript usetts Institute of Technology【Author】 Harold Abelson, Gerald Jay Sussman, Julie SussmanQiu zongyan[Series name]
-point increment, the accumulation of rounding error causes the pixel position calculated for the longer segment to deviate from the actual segment. And the rounding and floating-point operations in the process are still time consuming. We can improve the performance of the DDA algorithm by separating the increment m and 1/m into integers and fractional parts, so that all calculations are simplified to integer operations. The method of calculating 1/m increments with integer steps is discussed l
Computer questions (Elementary)-drawing the full-sky-star instance code (Java)
It is very simple to draw a small program with a canvas and a paint brush. It is suitable for beginners to learn and use:
Import java. awt. color; import java. awt. frame; import java. awt. graphics; import java. awt. panel; public class DrawStar {public static void main (String [] args) {Frame frame = new Frame (); frame. se
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 to a custom data type. It can represent 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 week has seven days, although classes can also
How to view all computer programs in Windows XP
Although Microsoft no longer supports the XP system, it may be a habit of using many people. Recently, user feedback from the XP system is provided. To better understand your computer, you can view all the programs in the computer
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
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 QR code below), from the introduction to advanced, in layman's words, Lao Ma and you explore the nature of Java programming and computer technology. Write attentively, original articles, and keep all copyrights.-----------Related high Praise original articleComputer Program Thinking Logic (6)-How to recover from garbled characters (top)?Thinking Logic of computer program (7)-How to recover from garbled
The AT program runs the commands and programs on the computer at the specified time and date. The AT command can only be used when the schedule service runs. If used without parameters, at lists the scheduled commands.
Grammar
at [\\ComputerName] [{[ID] [/delete]|/delete [/yes]}]
at [[\\ComputerName] hours:minutes [/interactive] [{/every:date[,...]|/next:date[,...]}] Command
Parameters
\\computername
Spe
Windows Internet Explorer 8 cannot be installed in xp sp3 because other programs or updates are waiting to restart your computer. solution:
Cause: the "Install update" button is selected during IE8 installation, and the IE-based third-party browser is not closed during installation. After the installation is completed and restarted, the installation fails. (Normally, ie is successfully upgraded aft
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 based on B-trees rather than binary trees),
Document directory
Multi-line and single-line JS Console
Extended reading: Interpreter and Compiler
Interactive Language
Test in the Javascript Console
Test in ironscheme
I recently read the construction and interpretation of computer programs (the second edition of the original book) and learned about the library Programming Language LISP dialect scheme. This non-mainstream programming language de
Thinking logic of computer programs (60) and thinking Logic
Section 57 introduces byte streams, and section 58 introduces byte streams. They all read and write files in the stream mode. There are several restrictions on the stream mode:
Either read or write, not both read and write
Random read/write is not allowed. It can only be read from the beginning and end, and cannot be read repeatedly. Although pa
Thinking logic of computer programs (3), thinking Logic
Operation
The first section describes how to define data through variables. The last section describes how to assign values to data. With an initial value, you can perform operations on the data. A computer is called a "computing" machine because it is invented for computation. There are different types of o
MySQL Installation and startup services, as well as the problems encounteredMySQL version: mysql-5.7.13-winx64.zip (Install-free, unzip the program folder, such as C:\Program files\mysql-5.7.13-winx64): Http://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.13-winx64.zipProblems encountered:1. MySQL Service has been installed successfully, created an empty data folder, also filled in the initialization INI file, but could not start2. Cmd execution instruction "mysql-uroot-p" prompt: "error 2003
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
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 arrange the ideas.The file should look very simple, but actually contains a lot of content,
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