CSharp - What is the output, Constructor and field

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Question

What is the output from the following code 

using System;
class MyClass
{
    int i;
    public MyClass(int i)
    {
        this.i = i;
    }
}
class Program
{
    static void Main(string[] args)
    {
        MyClass ob2 = new MyClass();
    }
}


Click to view the answer

Compilation error:  'MyClass' does not contain a constructor that takes 0 arguments.

Note

In C#, we can get a default 0 argument constructor if we do not define any constructor.

If we have a parameterized constructor, the compiler will not add a default 0 argument constructor for us.

if you want to remove this compilation error, you have following choices:

You can define one more custom constructor like this: 

public MyClass() { }

You can remove the custom constructor declaration from this program.

You can supply the necessary integer argument inside your Main() method like this: 

MyClass ob2 = new MyClass(25);

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