لخّصلي

int x 3; /* This is a comment that spans two lines */

Type Basics

A type defines the blueprint for a value.We also declared a variable of type int whose name was x.

static void Main()

1ntx12 30;

Console.WriteLine (x);

A variable denotes a storage location that can contain different values over time.Tolipper();

Console.Writeline (upperMessage);

// HELLO WORLD

int x 2012;

message= message + x.ToString();

// Hello world2012

Console.WriteLine (message);

The predefined bool type has exactly two possible values: true and faise.The string type represents a sequence of characters, such as NET or "http://oreilly.com. We can work with strings by calling functions on them as follows:

string message "Hello world";

string upperMessage message.For example:

int x 3; /* This is a comment that spans two lines */

Type Basics

A type defines the blueprint for a value. In our example, we used two literals of type int with values 12 and 30. We also declared a variable of type int whose name was x.

static void Main()

1ntx12 30;

Console.WriteLine (x);

A variable denotes a storage location that can contain different values over time. In contrast, a constant always represents the same value (more on this later):

const int y360;

All values in C# are instances of a type. The meaning of a value, and the set of possible values a variable can have, is determined by its type.

Predefined Type Examples

Predefined types are types that are specially supported by the compiler. The int type is a predefined type for representing the set of integers that fit into 32 bits of memory, from -231 to 231-1. We can perform functions such as arithmetic with instances of the int

type as follows:

int 12 30:

Another predefined C# type is string. The string type represents a sequence of characters, such as NET or "http://oreilly.com. We can work with strings by calling functions on them as follows:

string message "Hello world";

string upperMessage message. Tolipper();

Console.Writeline (upperMessage);

// HELLO WORLD

int x 2012;

message= message + x.ToString();

// Hello world2012

Console.WriteLine (message);

The predefined bool type has exactly two possible values: true and faise. The bool type is commonly used to conditionally branch execution flow based with an if statement. For example: