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Every .NET language uses the same variable data types. Different languages may provide slightly different names (for example, a VB Integer is the same as a C# int), but the CLR makes no distinction in fact, they are just two different names for the same base data type. This design allows for deep language integration. Because languages share the same core data types, you can easily use objects written in one .NET language in an application written in another .NET language. No data type conversions are required.

Note The reason all .NET languages have the same data types is because they all adhere to the common type

Note The reason all .NET languages have the same data types is because they all adhere to the common

system (CTS), a Microsoft-designed ECMA standard that sets the ground rules that all .NET languages must follow when dealing with data.

type system (CTS), a Microsoft-designed ECMA standard that sets out the ground rules that all .NET languages must follow when dealing with data.

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Because an abstract class does not define the implementation for every method it declares, it cannot be instantiated directly with the new operator Instead, a separate class must be created that extends the abstract class and overrides any previously declared abstract prototypes In extending the class, you will be able to create specialized objects that still maintain a common set of functionality To get the most out of abstract classes, you should remember the following rules: Any class that contains even one abstract method must also be declared abstract Any method that is declared abstract, when implemented, must contain the same or weaker access level For example, if a method is protected in the abstract class, it must be protected or public in the inheriting class; it may not be private You cannot create an instance of an abstract class using the new keyword.

To create this common data type system, Microsoft needed to iron out many of the inconsistencies that existed between VBScript, VB 6, C++, and other languages. The solution was to create a set of basic data types, which are provided in the .NET class library. Table 2-1 lists the most important core data types. Table 2-1. Common Data Types

To create this common data type system, Microsoft needed to iron out many of the inconsistencies that existed between VBScript, VB 6, C++, and other languages. The solution was to create a set of basic data types, which are provided in the .NET class library. Table 2-1 lists the most important core data types.

An integer from 0 to 255. An integer from 32,768 to 32,767. An integer from 2,147,483,648 to 2,147,483,647. An integer from about 9.2e18 to 9.2e18. A single-precision floating point number from approximately 3.4e38 to 3.4e38 (for big numbers) or 1.5e-45 to 1.5e-45 (for small fractional numbers). A double-precision floating point number from approximately 1.8e308 to 1.8e308 (for big numbers) or 5.0e-324 to 5.0e-324 (for small fractional numbers). A 128-bit fixed-point fractional number that supports up to 28 significant digits. A single Unicode character. A variable-length series of Unicode characters. A true or false value. Represents any date and time from 12:00:00 AM, January 1 of the year 1 in the Gregorian calendar, to 11:59:59 PM, December 31 of the year 9999. Time values can resolve values to 100 nanosecond increments. Internally, this data type is stored as a 64-bit integer.

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