Additional resources Preparing an installation source Installing, managing, and removing user-space components. The DVD ISO image file contains all repositories and software packages and does not require any additional configuration. See Preparing an installation source for more information.
Prerequisites You have an active Red Hat subscription. Optional: Select the Packages tab to view the packages contained in the selected variant. Prerequisites Install curl and jq package: If your distribution uses the yum package manager: yum install curl yum install jq If your distribution uses the dnf package manager: dnf install curl dnf install jq If your distribution uses the apt package manager: apt update apt install curl apt install jq.
Procedure Create a bash file with the following content:! Read 1 Reviews Write a Review. Who this book is for This book is for anyone who wants to learn how to use C to develop Windows Forms applications.
NET development environment. NET development. NET applications Visual Studio and the. NET programming languages The. NET Framework version used by a project. How to set options and create a new project How to set the Visual Studio options How to change the import and export settings How to create a new project How to design a form The design of the Invoice Total form How to add controls to a form How to set properties Common properties for forms and controls How to add navigation features The property settings for the Invoice Total form How to use Document Outline view How to name and save the files of a project How to name the files of a project How to save the files of a project.
An introduction to coding Introduction to object-oriented programming How to refer to properties, methods, and events How an application responds to events How to add code to a form How to create an event handler for the default event of a form or control How to delete an event handler How IntelliSense helps you enter the code for a form The event handlers for the Invoice Total form How to detect and correct syntax errors More coding skills How to code with a readable style How to code comments How to work with the Text Editor toolbar How to collapse or expand blocks of code How to zoom in and out How to highlight symbols How to print the source code How to use code snippets How to refactor code How to use the annotations in the scroll bar How to get help information How to run, test, and debug a project How to run a project How to test a project How to debug runtime errors.
How to work with the built-in value types The built-in value types How to declare and initialize variables How to declare and initialize constants How to code arithmetic expressions How to code assignment statements How to work with the order of precedence How to use casting How to use the Math class How to work with strings How to declare and initialize a string How to join and append strings How to include special characters in strings How to convert data types The.
NET structures and classes that define data types How to use methods to convert data types How to use methods to convert numbers to formatted strings Three other skills for working with data How to work with scope How to declare and use enumerations How to work with nullable types and the null-coalescing operator Two versions of the Invoice Total application The basic Invoice Total application The enhanced Invoice Total application.
How to code Boolean expressions How to use the relational operators How to use the logical operators How to code conditional statements How to code if-else statements How to code switch statements An enhanced version of the Invoice Total application How to code loops How to code while and do-while loops How to code for loops Loops that use break and continue statements Debugging techniques for programs with loops The Future Value application The design and property settings for the form The code for the form.
How to code and call methods How to code methods How to call methods How to use optional parameters How to use named arguments How to use refactoring to create a new method and its calling statement When and how to pass arguments by reference and by value How to work with events and delegates How to generate an event handler for any event How event wiring works How to handle multiple events with one event handler Another version of the Future Value application The event handlers and the CalculateFutureValue method Some of the generated code.
An introduction to exceptions How exceptions work How to display a dialog box How to use structured exception handling How to catch an exception How to use the properties and methods of an exception How to catch specific types of exceptions How to throw an exception The Future Value application with exception handling How to validate data How to validate a single entry How to use generic methods to validate an entry How to validate multiple entries The Future Value application with data validation The dialog boxes The code.
How to work with one-dimensional arrays How to create an array How to assign values to the elements of an array How to work with arrays How to use foreach loops to work with arrays How to work with rectangular arrays How to create a rectangular array How to assign values to a rectangular array How to work with rectangular arrays How to work with jagged arrays How to create a jagged array How to assign values to a jagged array How to work with jagged arrays More skills for working with arrays How to use the Array class How to refer to and copy arrays How to code methods that work with arrays How to use the null-conditional operator How to work with collections Commonly used collection classes Typed vs.
How to work with dates and times How to create a DateTime value How to get the current date and time How to format DateTime values How to get information about dates and times How to perform operations on dates and times How to work with strings The properties and methods of the String class Code examples that work with strings More code examples that work with strings How to use the Parse and TryParse methods to validate numeric entries How to use the StringBuilder class How to format numbers, dates, and times How to format numbers How to format dates and times How to use interpolated strings.
Basic debugging techniques How to set the debugging options How to work in break mode How to use the Edit and Continue feature How to work with data tips How to use breakpoints How to control the execution of an application How to use the debugging windows How to use the Locals window to monitor variables How to use the Autos window to monitor variables How to use Watch windows to monitor expressions How to use the Immediate window to execute commands How to use the Call Stack window to monitor called methods How to use the Call Hierarchy window to navigate through your code How to use the Output window to view project information How to write data to the Output window How use the Visualizer dialog boxes to view strings.
An introduction to classes How classes can be used to structure an application The members you can define within a class The code for the Product class How instantiation works Basic skills for creating a class How to add a class file to a project How to code fields How to code properties How to code methods How to code constructors How to code static members The Product Maintenance application The operation of the Product Maintenance application The classes used by the Product Maintenance application The code for the Product Maintenance application More skills for creating a class How to code auto-implemented properties How to code expression-bodied properties and methods How to generate code stubs How to browse, diagram, and display and edit classes How to browse the classes in a solution How to use class diagrams and the Class Details window How to use the Peek Definition window How to work with structures How to create a structure How to use a structure.
An introduction to the ProductList class The code for a simple ProductList class The specifications for the enhanced ProductList class How to work with indexers How to create an indexer How to throw an argument exception How to work with delegates and events How to define and use a delegate How to define and use events How to use anonymous methods and lambda expressions with delegates and events How to overload operators An introduction to operator overloading How to overload arithmetic operators How to overload relational operators An enhanced version of the Product Maintenance application The code for the ProductList class The code for the Product Maintenance form.
An introduction to inheritance How inheritance works How the. How to work with interfaces An introduction to interfaces Some of the interfaces defined by the. NET Framework How to create an interface How to implement an interface A Product class that implements the ICloneable interface How to use an interface as a parameter How to work with generics How to code a class that defines a generic collection Some of the generic interfaces defined by the.
How to organize your classes How to code multiple classes in a single file How to split a single class across multiple files How to work with namespaces How to document your classes How to add XML documentation to a class How to view the XML documentation How to create and use class libraries How class libraries work How to create a class library project How to add a reference to a class library How to use the classes in a class library.
NET The. NET components work Concurrency and the disconnected data architecture How a dataset is organized How to work with data without using a data adapter Two ways to create ADO. NET objects. How to create a data source How to use the Data Sources window How to start the Data Source Configuration Wizard How to choose a data source type How to choose the database model for a data source How to choose the connection for a data source How to create a connection to a database How to save a connection string in the app.
The forever loop block means Scratch will check over and over again whether the up arrow key is being pressed. This continues until you click the red stop sign. The forever block is needed for this program to work.
Without it, Scratch would check only once if the up arrow key was pressed. Then the program would end. When you code this on your own, be sure you use the change y by code block instead of the change x by or set y to code block. This code is similar to the code to move the cat sprite up. To save time, you can right-click or long press the orange if then block and select Duplicate to create a copy of the blocks.
Duplicating blocks can often be faster than dragging new ones from the Block Palette. Scratch will now check if the four arrow keys are held down, one after another. After checking the right arrow key, Scratch starts back at the top of the loop and checks the up arrow key again. The computer checks them so fast that to human eyes, it looks like all of the arrow keys are being checked at the same time!
In the Scratch editor, click the Upload Sprite button, which appears after you tap or hover over the Choose a Sprite button which looks like a face and select Maze. This creates a new sprite named Maze with several maze costumes.
Every sprite in Scratch can have multiple costumes to change the way it looks. These costumes, which you can see by clicking the Costumes tab, are often used to animate the sprite.
You can use whichever backdrop you like. Choose a backdrop I chose Light. Add the following code to the Maze sprite.
You can find these blocks in the Events , Looks , and Motion categories. When the player clicks the green flag to start the program, the game should begin with the first costume and make sure the maze is in the center of the Stage. We will add code to switch to the next level in steps 8 and 9. Note that the Code Area shows code blocks for the selected sprite. Each sprite needs its own code to work correctly. If it is, the cat should back away.
So if the cat moves to the right and is touching a wall, it should automatically move left. Click the Orange Cat sprite in the Sprite List and modify the code to look like the following. Right-click or long press the Apple sprite and select Duplicate to make a copy of the Apple sprite and its code. The new sprite is automatically named Apple2. Select the A pple2 sprite and click the Costumes tab. Select a green fill color and then select the Fill tool to the right it looks like a tipped cup.
Then click the red part of the apple to change it to green. Right-click or long press the Orange Cat sprite and select Duplicate from the menu to make a copy of Orange Cat and its code. The new sprite is automatically named Orange Cat2. The Orange Cat and Orange Cat2 sprites need to look different enough that the players can tell them apart. Similar to what you did for Apple2 , click the Costumes tab and change Orange Cat2 from orange to blue.
Right now the Blue Cat sprite has the same code as the Orange Cat sprite. The W, A, S, and D keys are often used as a left-handed version of the up, left, down, and right arrow keys. Change the two go to x y blocks and the key pressed? Also, remember to change if touching Apple to if touching Apple2.
The sprites go back to their starting positions when they touch their apples, but they also need to go there when the other cat wins. Add the following script to the Orange Cat sprite:. Then add the following script to the Blue Cat sprite:. This way, when the other cat wins and broadcasts the next maze message, both cats will go back to their starting positions.
Find a friend to race against. Player 1 uses the arrow keys, and player 2 uses the WASD keys. Also, it would be too obvious that a player was cheating if they suddenly moved across the Stage and through many walls.
However, you can add a subtler cheat that lets the cats move through walls when a special key is held down. For the Orange Cat sprite, modify the walking code so the touching Maze? This enables the wall-blocking code only if the L key is not being pressed. If the L key is pressed, this wall-blocking code is skipped, and the player walks through the walls.
Make the same walk-through-walls code changes to the Blue Cat sprite, except instead of key l pressed , make it key q pressed. The second player can walk through walls when the Q key is held down. A two-player game is more exciting than a single-player game.
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