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If you are dealing only with positive numeric values, unsigned integers are more memory efficient (although unless you are dealing with a very large volume of numbers, the need to worry about saving 8 bits per value rarely arises) A real number, often called a floating-point number, has a fraction; in C# this fraction is expressed using a decimal point, such as 35, 902, or 500007 The float, double, and decimal types hold real numbers The float and double types are usually used for scientific calculations, while the decimal type is usually used for financial calculations where extra precision is required, but that extra precision comes at the cost of lower performance when performing operations on decimal values.

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Listing 5-9 shows the maximum and minimum values that the float, double, and decimal can represent, but the purpose of these types is to handle accuracy following the decimal place The double type can hold 15 significant figures, and the float type can hold seven significant figures The decimal type can hold 28 significant figures; calculations involving the decimal type are about 10 times slower to perform that those involving the double type..

Figure 14-1

Tip The size of different numeric values is always constant in .NET so, for example, an int is always 32 bits, even when your code is executing on a 64-bit system.

C# allows you to define numeric values literally so that you can just use the value of the number in a statement, like this:

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2 Answers. Android has the " Barcode Scanner " app that can handle QR codes . ... Being Android, it's written in Java (although using the Android API rather than J2SE, but that it should be trivial to port the part of the source that decodes the QR code ).

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This is nothing fancy, but it does walk through the tree for you. Feel free to add more output options for different event types. The second half of the StAX API is the Iterator API (Listing 6-17), which works slightly differently from the Cursor API. Instead of having to go back to the stream to get the associated data for each element you get from the cursor, you instead get an XMLEvent back as you walk through the iteration. Each XMLEvent thus has its associated data with it, like the name for the start element or the text data for the characters.

int x = 23;

In this statement, I used the int keyword to define a variable called x with a value of 23. I didn t have to use the new keyword or declare the value in a special way. I just used the value I wanted, and C# took

40% 35% 30% percent of total 25% 20% 15% 10% 5% 0%

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As you might have guessed from the title of this chapter, you can query the contents of a DataSet using LINQ. This means you can execute the SQL query on the database and then use LINQ to query the results in different ways on your computer. Listing 31-7 provides a demonstration. Listing 31-7. Querying a DataSet Using LINQ using using using using using System; System.Collections.Generic; System.Configuration; System.Data; System.Data.SqlClient;

class Listing 07 { static void Main(string[] args) { // get the connection string from the config file ConnectionStringSettings connStringSettings = ConfigurationManager.ConnectionStrings["NorthwindConnection"]; // create the connection object SqlConnection myConnection = new SqlConnection(connStringSettings.ConnectionString); // create the SqlDataAdapter SqlDataAdapter myAdapter = new SqlDataAdapter( "SELECT * FROM Employees", myConnection);

// create the DataSet object DataSet myDataSet = new DataSet(); // fill the dataset into the named table myAdapter.Fill(myDataSet, "Employees"); // query the results with LINQ IEnumerable<DataRow> cityResults = from row in myDataSet.Tables["Employees"].AsEnumerable() where row.Field<string>("City") == "London" select row; // enumerate the results foreach (DataRow row in cityResults) { Console.WriteLine("City Result: {0} {1}", row.Field<string>("FirstName"), row.Field<string>("Lastname")); } // use LINQ to perform a different query on the same data var titleResults = from row in myDataSet.Tables["Employees"].AsEnumerable() where row.Field<string>("Title") == "Sales Representative" select new { Firstname = row.Field<string>("FirstName"), LastName = row.Field<string>("Lastname") }; // enumerate the second set of results foreach (var item in titleResults) { Console.WriteLine("Title Result: {0} {1}", item.Firstname, item.LastName); } // close the database connection myConnection.Close(); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } In this example, I execute a SQL query that selects all the rows in the Employees table in the database. I then use the DataTable object as a data source for a LINQ query: IEnumerable<DataRow> cityResults = from row in myDataSet.Tables["Employees"].AsEnumerable() where row.Field<string>("City") == "London" select row;

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Topic: qrcode-reader · GitHub
QR Code Generator and Reader in Java ... sample project for Barcode and QR code scanning or reading or detecting powered by Google Mobile Vision AP…

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