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Then, choose Next. In the Additional information window,. NET Core 3. If not, select. Then, choose Create. Next, choose Windows from the Platform list and Console from the Project types list.

NET desktop development workload. NET 6. Let's create an app that prompts you for your name and then displays it along with the date and time. Here's how:. Enter the following Visual Basic code immediately after the opening bracket that follows the Sub Main args As String line and before the End Sub line:.

Use the green Start button, or press F5 to build and run your first app. When the console window opens, enter your name. Your console window should look similar to the following screenshot:. This code replaces the existing WriteLine statement. Then name the file CalculateThis. Enter the following code between the Module Program line and the End Module line:.

Click CalculateThis to run your program. Then, in the Configure your new project window, type or enter CalculateThis in the Project name box. Enter the following code between the Module Program line and End Module line:. In Program. Select the green Start button next to CalculateThis to run your program. Now that you've created an app, you might want to add it to a Git repository. We've got you covered.

Git is the most widely used modern version control system, so whether you're a professional developer or you're learning how to code, Git can be very useful. There, you can find cheat sheets, a popular online book, and Git Basics videos.

To associate your code with Git, you start by creating a new Git repository where your code is located. The repository name auto-populates based on your folder location. By default, your new repository is private, which means you're the only one who can access it. Whether your repository is public or private, it's best to have a remote backup of your code stored securely on GitHub.

Even if you aren't working with a team, a remote repository makes your code available to you from any computer. You can use this icon to pull any incoming commits or push any outgoing commits. You can also choose to view these commits first. The eShopOnContainers application is an open-source reference app for.

NET and microservices that is designed to be deployed using Docker containers. It also includes the back-end microservices and containers for all required server-side operations. The purpose of the application is to showcase architectural patterns. In fact, the application is in a permanent beta state, as it's also used to test new potentially interesting technologies as they show up.

We wrote this guide to help you understand the architecture of containerized applications and microservices in. The guide and related reference application will be evolving, so we welcome your feedback! All rights reserved. No part of the contents of this book may be reproduced or transmitted in any form or by any means without the written permission of the publisher.

This book is provided "as-is" and expresses the author's views and opinions. The views, opinions and information expressed in this book, including URL and other Internet website references, may change without notice. Some examples depicted herein are provided for illustration only and are fictitious. No real association or connection is intended or should be inferred.

Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback? Submit and view feedback for This product This page. If you have components checked for compliance by the Visual Basic compiler, you can use the CLSCompliant attribute at class level, as follows:. The following short sections describe the use of numeric data types and the range of values that you can represent with each numeric type.

Represents: Integer values numbers without decimal points in the specified range. Description: This data type stores only unsigned positive numbers in the specified numeric range. Conversion of other numeric types: CByte objVar or Convert.

ToByte objVar. Description: This data type saves negative and positive numbers in the specified numeric range. ToSByte objVar. Description: This data type stores signed numbers both negative and positive in the specified range.

Conversion of other numeric types: CShort objVar or Convert. ToInt16 objVar. Represents: Positive integer values numbers without decimal points in the specified range. Description: This data type stores unsigned numbers positive only in the specified numeric range. ToUInt16 objVar. However, in the interest of better programming style, you should avoid this technique. Conversion of other numeric types: CInt objVar or Convert. ToInt32 objVar. Description: This data type stores unsigned numbers positive only in the specified range.

ToUInt32 objVar. Conversion to all other integer data types can cause an OutOfRangeException , due to the larger scope of Long.

Conversion of other numeric types: CLng objVar or Convert. ToInt64 objVar. ToUInt64 objVar. Represents: Floating-point values numbers with decimal points whose scale becomes smaller with the increasing value in the specified range. Range: —3. Conversion of other numeric types: CSng objVar or Convert. ToSingle objVar. Range: —1. Description: This data type stores numbers both negative and positive in the specified range.

Conversion of other numeric types: CDbl objVar or Convert. ToDouble objVar. Range: Depends on the number of used decimal places. For very high values, you must attach the type literal to a literal constant to avoid an Overflow error message. No arithmetic functions are delegated to the processor for the data type Decimal.

Therefore, this data type is processed much more slowly than the floating-point data types Single and Double. At the same time, however, there will be no rounding errors due to the internal display of values in the binary system.

You will learn more about this in the following section. Conversion of other numeric types: CDec objVar or Convert. ToDecimal objVar. Note: This is the fastest data type for floating-point number calculations because it is delegated directly to the math unit of the processor for calculation.

Note: This is the lowest data type for floating-point number calculations, but its special form of representing values excludes typical computer rounding errors. You have already experienced rounding and conversion errors from one numeric system into another in your daily life with the base system.

For example, dividing the number 1 by 3 results in a number with infinite decimal points 0. In the decimal system, this also corresponds to 1. But performing this same addition in the decimal system is imprecise, because even if you use 60 decimal places to represent the number, you never reach the value 1 in the addition, as shown here:. If you have multiple intermediate results during the course of a calculation, such representation errors can quickly lead to bigger mistakes that will become relevant at some point.

The computer has the same problem with certain numbers when it calculates in the binary system. Even though it can display the number Converting 69 works without issues, but it becomes difficult with 0.

Once you know that decimal places are represented by negative powers of the base number, you can try to approximate the fractional part 0. At this point, the computer has generated the binary digits 0. The truth is that you can play this game for all eternity, but you will never be able to represent the number 0.

Although the second part of the program achieves the correct result using the Decimal data type, the Double type fails in the first part of the program. The second WriteLine method is even more confusing, because both variables appear to contain the same value to the last decimal place.

So what happened here? During the conversion from the internal binary number system to the decimal number system, a rounding error takes place that conceals the true result. Based on this experiment, the following remarks can be made. If at all possible, try to avoid using fractioned Double or Single values as counters or conditions within a loop; otherwise, you run the risk that your program becomes bogged down in endless loops as a result of the inaccuracies just mentioned.

Therefore, follow these rules:. Use Single and Double data types only where the umpteenth number behind the comma is not important. For example, when calculating graphics, where rounding errors are irrelevant due to a smaller screen resolution, you should always choose the faster processor-calculated data types, Single and Double , over the manually calculated Decimal data type. When working with finance applications you should always use the Decimal data type.

If possible, never use the Decimal data type in loops, and do not use it as a counter variable. Try to get by with one of the many integer variable types. When you need to compare Double and Single variables to one another, you should query their deltas rather than comparing the values directly, as in the following code:.

All numeric data types have methods that are used the same way for all types. They convert a string into the corresponding numeric value or a numeric value into a string. Other methods serve to determine the largest or smallest value a data type can represent. The static functions Parse and TryParse are available to all numeric data types to convert a string into a value. Because Parse is a static function, you should no longer call it via an object variable—use only the corresponding class name.

A program that addresses the static function via an object variable can still be compiled, but the Code Editor will display a warning. If the conversion is successful, the converted number is displayed in the output variable— locInteger in this example.