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Expression classifications

Expression classifications An expression is classified as one of the following: A value. Every value has an associated type. A variable. Every variable has an associated type, namely the declared type of the variable. A namespace. A
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Expression statements

Expression statements An expression-statement evaluates a given expression. The value computed by the expression, if any, is discarded. expression-statement: statement-expression   ; statement-expression: invocation-expression object-cre
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Unsafe code - Unsafe contexts

Unsafe code The core C# language, as defined in the preceding chapters, differs notably from C and C++ in its omission of pointers as a data type. C# instead provides references and the ability to create objects that are managed by a garbage c
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Logical operators

Logical operators The &, ^, and | operators are called the logical operators. and-expression: equality-expression and-expression   &   equality-expression exclusive-or-expression: and-expression exclusive-or-expression   ^   and
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Interoperability - The ComAliasName attribute

Interoperability The attributes described in this chapter are used for creating programs that interoperate with COM programs. The ComAliasName attribute namespace System.Runtime.InteropServices            public string Value }    
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Types - Predefined types, Array

Types C# supports two kinds of types: value types and reference types. Value types include simple types (e.g., char, int, and float), enum types, and struct types. Reference types include class types, interface types, delegate types, and array
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Primary expressions - Postfix increment and decrement operators

Primary expressions Primary expressions include the simplest forms of expressions. primary-expression: array-creation-expression primary-expression-no-array-creation primary-expression-no-array-creation: literal simple-name parenthesiz
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Program Startup

Program Startup Program startup occurs when the execution environment calls a designated method, which is referred to as the program's entry point. This entry point method is always named Main, and can have one of the following signatures:
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User-defined conversions

User-defined conversions C# allows the pre-defined implicit and explicit conversions to be augmented by user-defined conversions. User-defined conversions are introduced by declaring conversion operators (§‎10.9.3) in class and struct type
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Labeled statements

Labeled statements A labeled-statement permits a statement to be prefixed by a label. Labeled statements are permitted in blocks, but are not permitted as embedded statements. labeled-statement: identifier   :   statement A labeled state
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void Finalize();Constants

void Finalize();Constants A constant is a class member that represents a constant value: a value that can be computed at compile-time. A constant-declaration introduces one or more constants of a given type. constant-declaration: attributes
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Namespaces and assemblies

Namespaces and assemblies The programs presented so far have stood on their own except for dependence on a few system-provided classes such as the System.Console class. It is far more common for real-world programs to consist of several differe
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Enums

Enums An enum type declaration defines a type name for a related group of symbolic constants. Enums are used for “multiple choice” scenarios, in which a runtime decision is made from a fixed number of choices that are known at compile-time.
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Member access - Declared accessibility

Member access Declarations of members allow control over member access. The accessibility of a member is established by the declared accessibility (§‎3.5.1) of the member combined with the accessibility of the immediately containing type
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Structs - Struct declarations

Structs Structs are similar to classes in that they represent data structures that can contain data members and function members. Unlike classes, structs are value types and do not require heap allocation. A variable of a struct type directly c
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Explicit conversions

Explicit conversions The following conversions are classified as explicit conversions: All implicit conversions. Explicit numeric conversions. Explicit enumeration conversions. Explicit reference conversions. Explicit interfac
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Default values

Default values The following categories of variables are automatically initialized to their default values: Static variables. Instance variables of class instances. Array elements. The default value of a variable depends on the
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Instance constructors

Instance constructors An instance constructor is a member that implements the actions required to initialize an instance of a class. Instance constructors are declared using constructor-declarations: constructor-declaration: attributesopt  
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Unary expressions

Unary expressions Issue We need to write this section. unary-expression: primary-expression +   unary-expression -   unary-expression !   unary-expression ~   unary-expression *   unary-expression pre-increment-expression pre
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Declaration statements

Declaration statements A declaration-statement declares a local variable or constant. Declaration statements are permitted in blocks, but are not permitted as embedded statements. declaration-statement: local-variable-declaration   ; local-
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