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« Field initialization and default value
const value »
 

Default value for each type

Class fields are auto-initialized

C# initializes the class fields automatically.


using System;

class Rectangle{
   public int Width;
   public int Height;
}


class Program
{
    static void Main(string[] args)
    {
        Rectangle r = new Rectangle();
        Console.WriteLine(r.Width);
    }
}

The output:


0

From the output we can see that the Width is initialized to 0.

The following table shows the auto-initialized value for each predefined data types:

TypeDefault value
Reference typesnull
numeric types0
enum types0
char type'\0'
bool typefalse

using System;

class Test{
   public char ch;
   public bool b;
   public int i;
   public string str;
}




class Program
{
    static void Main(string[] args)
    {
        Test t = new Test();
        Console.WriteLine(t.ch);
        Console.WriteLine(t.b);
        Console.WriteLine(t.i);
        Console.WriteLine(t.str);

    }
}

The output:


False
0
« Field initialization and default value
const value »
 
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