Initializing Various Types of Variables in C#
Aug 22, 2015 02:00 0 Comments C# (C-Sharp) Pavan

                               Initializing Various Types of Variables in C#

A variable is nothing, but a name given to a storage area that our programs can manipulate. Each variable in C# has a specific type, which determines the size and layout of the variable's memory the range of values that can be stored within that memory and the set of operations that can be applied to the variable.

The basic value types provided in C# can be categorized as −

Type

Example

Integral types

sbyte, byte, short, ushort, int, uint, long, ulong, and char

Floating point types

float and double

Decimal types

decimal

Boolean types

true or false values, as assigned

Nullable types

Nullable data types

 

Defining Variables

Syntax for variable definition in C# is −

;

Here, data_type must be a valid C# data type including char, int, float, double, or any user-defined data type, and variable_list may consist of one or more identifier names separated by commas.

Some valid variable definitions are shown here −

int i, j, k;

char c, ch;

float f, salary;

double d;

You can initialize a variable at the time of definition as int i = 100;

Initializing Variables

Variables are initialized (assigned a value) with an equal sign followed by a constant expression. The general form of initialization is −

variable_name = value;

Variables can be initialized in their declaration. The initializer consists of an equal sign followed by a constant expression as −

= value;

Some examples are −

int d = 3, f = 5;    /* initializing d and f. */

byte z = 22;         /* initializes z. */

double pi = 3.14159; /* declares an approximation of pi. */

char x = 'x';        /* the variable x has the value 'x'. */

It is a good programming practice to initialize variables properly, otherwise sometimes program may produce unexpected result.

The following example uses various types of variables −

using System;

namespace VariableDefinition {

   class Program {

      static void Main(string[] args) {

         short a;

         int b ;

         double c;

  /* actual initialization */

         a = 10;

         b = 20;

         c = a + b;

         Console.WriteLine("a = {0}, b = {1}, c = {2}", a, b, c);

         Console.ReadLine();

      }

   }

}

When the above code is compiled and executed, it produces the following result −

a = 10, b = 20, c = 30

Accepting Values from User

The Console class in the System namespace provides a function ReadLine() for accepting input from the user and store it into a variable.

For example,

int num;

num = Convert.ToInt32(Console.ReadLine());

The function Convert.ToInt32() converts the data entered by the user to int data type, because Console.ReadLine() accepts the data in string format.

 

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