Csharp/CSharp Tutorial/struct/struct initialization

How to initialize a structure

using System; 
 
// Define a structure. 
struct Book { 
  public string author; 
  public string title; 
  public int copyright; 
 
  public Book(string a, string t, int c) { 
    author = a; 
    title = t; 
    copyright = c; 
  } 
} 
 
class MainClass { 
  public static void Main() { 
    Book book1 = new Book("author", "Book name", 2005);
 
    Book book2 = new Book(); // default constructor 
    Book book3; 
 
    Console.WriteLine(book1.title + " by " + book1.author + ", (c) " + book1.copyright); 
    Console.WriteLine(); 
 
    if(book2.title == null) 
      Console.WriteLine("book2.title is null."); 
    book2.title = "title"; 
    book2.author = "author"; 
    book2.copyright = 1932; 
    Console.Write("book2 now contains: "); 
    Console.WriteLine(book2.title + " by " + book2.author + ", (c) " + book2.copyright); 
 
    Console.WriteLine(); 
 
    // Console.WriteLine(book3.title); // error, must initialize first 
    book3.title = "Red Storm Rising"; 
 
    Console.WriteLine(book3.title); // now OK 
  } 
}

Book name by author, (c) 2005
book2.title is null.
book2 now contains: title by author, (c) 1932
Red Storm Rising

Use this to reference struct"s constructor

public struct ComplexNumber
{
   public ComplexNumber( double real, double imaginary )
   {
      this.real = real;
      this.imaginary = imaginary;
   }
   public ComplexNumber( double real ):this( real, 0 )
   {
      this.real = real;
   }
   private double real;
   private double imaginary;
}
public class MainClass
{
   static void Main()
   {
      ComplexNumber valA = new ComplexNumber( 1, 2 );
   }
}