C# Implicitly Typed Local Variable

In C#, we can create local variable without specifying its type. The C# var keyword is used to create implicit typed local variables. The C# compiler infers the types of variable on the basis of assigned value.

The var keyword can be used in following context.

To create local variables inside a method block.
In loop construct to initialize variable.
In using statement to store resource reference.

The var keyword has following restrictions.

It should use to declare and initialize local variable in the same statement.
It cannot be used to declare class variables.
It cannot be used to initialize multiple implicitly-typed variables in the same statement.
It cannot be used in initialization expression. Ex. var a = (a=220);

Let's see an example. Here, we have created integer, string and array type local variables.

C# Implicit Typed Local Variable Example

using System;
namespace CSharpFeatures
{
    class ImplicitTypedExample
    {
        public static void Main()
        {
            // integer
            var a = 20;
            // string
            var s = "javatpoint";
            // array
            var arr = new[] { 1,2,3};  
            Console.WriteLine(a);
            Console.WriteLine(s);
            Console.WriteLine(arr[2]);
        }
    }
}

Output: