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D语言结构初始化

import std.stdio;

struct Books { 
   char [] title; 
   char [] subject = Empty.dup; 
   int   book_id = -1; 
   char [] author = Raj.dup;  
}; 

void main( ) { 
   Books Book1 = Books(D Programming.dup, D Programming Tutorial.dup, 6495407 ); 
   printBook( Book1 ); 

   Books Book2 = Books(D Programming.dup, 
      D Programming Tutorial.dup, 6495407,Raj.dup ); 
   printBook( Book2 );

   Books Book3 =  {title:Obj C programming.dup, book_id : 1001};
   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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