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Course Introduction：The syntax of the trigonometric operator in C is condition?expression1:expression2, which is used to select and execute different expressions according to the condition. 1) Basic usage example: intmax=(x>y)?x:y, used to select the larger value in x and y. 2) Example of nested usage: intresult=(a>0&&b>0)?a b:(a==0||b==0)?a*b:a-b, used to perform different operations according to different conditions. 3) Error handling example: std::stringerrorMessage=(errorCode==0)?"Successful&quo

2025-05-23 comment 0  327

Course Introduction：Hi, it was 213 again yesterday. Although it was objectively affected by the fact that my roommate didn’t go to bed until after 3 o’clock, the fundamental reason was that I didn’t want to study last night. Start it today. I plan to finish learning PDO and Ajax within 3 or 4 days. I hope everyone will come and scold me if they have nothing to do, so that I won't be lazy again. 1. PDO 2. Use of PDO objects (2) 2.2 Error message errorCode() error number; errorInfo(

2016-07-06 comment 0  1141

Course Introduction：ErrorCode:1045 encountered in MySQLWorkbench, which is usually caused by password error, permission configuration problems or user failure; solutions include: 1. Check whether the user name and password are correct, it is recommended to test login through the command line mysql-uroot-p; 2. If the password is wrong, you can skip permission verification and reset the password. The specific steps are to stop the service, start with skip-grant-tables, update the password and restart the service; 3. Check whether the 'root'@'localhost' exists, if not, you need to create and authorize it; 4. Troubleshoot other reasons such as whether the service is running, whether the configuration file is abnormal, and whether the authentication plug-in is suitable, such as modifying it to mysql_nati

2025-06-26 comment 0  736

Course Introduction：SqlParameter Parameters.Add vs. AddWithValue: Choosing the Best MethodWhen working with SQL commands, you may encounter the need to add...

2025-01-10 comment 0  651

Course Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w

2025-01-10 comment 0  772

Course Elementary  13738

Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.

Course Elementary  82245

Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).

Course Elementary  13128

Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.

Course Elementary  24572

Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.

Course Elementary  27433

Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.