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Comparison Between C++ and C#

The following table contains important comparisons between C++ and C# features. If you are a C++ programmer, this table will give you the most important differences between the two languages at a glance. For details, use the link to browse to the detailed topic.

Note   C++ and C# projects are derived from different project models. For information on the differences between C++ and C# projects, see Item Management in Projects and Using Solution Explorer.
Feature Refer to the topic
Inheritance: A class can inherit implementation from one base class only. Also a class or an interface can implement multiple interfaces. class

interface

Arrays: The syntax of declaring C# arrays is different from that of C++ arrays. The tokens "[]" appear following the array type in C#. Arrays
The bool type: There is no conversion between the bool type and other types (specifically int). bool
The long type: In C#, the long data type is 64 bits, while in C++, it is 32 bits. long
The struct type: In C#, classes and structs are semantically different. A struct is a value type, while a class is a reference type. struct

class

The switch statement: Unlike the C++ switch statement, C# does not support fall through from one case label to another. switch
The delegate type: Delegates are roughly similar to function pointers in C++, but they are type-safe and secure. delegate
Calling the overridden base class members from derived classes. base

See also the examples for override

Using the new modifier to explicitly hide an inherited member. new
Declaring override methods requires the override keyword. override
Preprocessor directives are used for conditional compilation. No header files are used in C#. C# Preprocessor Directives
Exception handling: Using the finally statement. try-finally

try-catch-finally

C# operators: C# supports additional operators such as is and typeof. It also introduces different functionality of some logical operators. & Operator

| Operator

^ Operator

is

typeof

Use of the extern keyword. extern
Use of the static keyword. static
An alternative way to the C++ initialization list in constructing the base class. See the examples for virtual
The general structure of the C# program: namespaces, classes, structs, delegates, and enumerations. General Structure of a C# Program
The Main method is declared differently from the main function in C++. Also, compare the usage of the command-line arguments for each language. Main
Method parameters: C# supports ref and out parameters, which are used instead of pointers in passing parameters by reference. ref

out

Pointers are allowed in C# but only in unsafe mode. unsafe
Overloading operators is performed differently in C#. C# Operators
Strings: C# strings are different from C++ strings. string
The foreach keyword allows you to iterate through arrays and collections. foreach, in
No global methods or variables in C#: Methods and variables must be contained within a type declaration (such as class or struct). General Structure of a C# Program
No header files or #include directives in C#: The using directive is used to reference types in other namespaces without fully qualifying the type names. using
Local variables in C# cannot be used before they are initialized. 5. Variables
Destructors: In C#, you don't have control over when a destructor is called because destructors are called automatically by the garbage collector. Destructors
Constructors: Similar to C++, if you don't provide a class constructor in C#, a default constructor is automatically generated for you. The default constructor initializes all the fields to their default values. Instance Constructors

Default Values Table

C# does not support bit fields. C++ Bit Fields
C# input/output services and formatting rely on the run-time library of the .NET Framework. C# Language Tour

Formatting Numeric Results Table

In C#, method parameters cannot have default values. Use method overloads if you want to achieve the same effect. Compiler Error CS0241

For comparisons between C# and other programming languages, see the Language Equivalents documentation.

See Also

C# Language Tour | Item Management in Projects | Using Solution Explorer

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