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D语言静态成员

import std.stdio;  

struct Books { 
   char [] title; 
   char [] subject = Empty.dup; 
   int   book_id; 
   char [] author = Raj.dup; 
   static int id = 1000; 
}; 

void main( ) { 
   Books Book1 = Books(D Programming.dup, D Programming Tutorial.dup,++Books.id ); 
   printBook( Book1 );  

   Books Book2 = Books(D Programming.dup, D Programming Tutorial.dup,++Books.id); 
   printBook( Book2 );  

   Books Book3 =  {title:Obj C programming.dup, book_id:++Books.id}; 
   printBook( Book3 ); 
}

void printBook( Books book ) { 
   writeln( Book title : , book.title); 
   writeln( Book author : , book.author); 
   writeln( Book subject : , book.subject); 
   writeln( Book book_id : , book.book_id); 
}

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