结构体指针

您可以定义结构体指针，以一种定义指向其他变量的指针非常相似的方式，如下所示：

    struct Books *struct_pointer;

现在，您可以用上面定义的指针变量存储一个结构变量的地址。找到一个结构变量的地址，把操作符 & 置于结构体名称的前面，如下所示：

    struct_pointer = &Book1;

为了通过一个指向结构的指针访问结构体成员，必须使用 -> 操作符，如下所示：

    struct_pointer->title;

让我们使用结构指针重写上面的例子，希望这将帮助你更容易理解这个概念：

    #include <iostream>
    #include <cstring>

    using namespace std;
    void printBook( struct Books *book );

    struct Books
    {
       char  title[50];
       char  author[50];
       char  subject[100];
       int   book_id;
    };

    int main( )
    {
       struct Books Book1;// Declare Book1 of type Book
       struct Books Book2;// Declare Book2 of type Book

       // Book 1 specification
       strcpy( Book1.title, "Learn C++ Programming");
       strcpy( Book1.author, "Chand Miyan"); 
       strcpy( Book1.subject, "C++ Programming");
       Book1.book_id = 6495407;

       // Book 2 specification
       strcpy( Book2.title, "Telecom Billing");
       strcpy( Book2.author, "Yakit Singha");
       strcpy( Book2.subject, "Telecom");
       Book2.book_id = 6495700;

       // Print Book1 info, passing address of structure
       printBook( &Book1 );

       // Print Book1 info, passing address of structure
       printBook( &Book2 );

       return 0;
    }
    // This function accept pointer to structure as parameter.
    void printBook( struct Books *book )
    {
       cout << "Book title : " << book->title <<endl;
       cout << "Book author : " << book->author <<endl;
       cout << "Book subject : " << book->subject <<endl;
       cout << "Book id : " << book->book_id <<endl;
    }

编译和执行上面的代码，执行结果如下：

    Book title : Learn C++ Programming
    Book author : Chand Miyan
    Book subject : C++ Programming
    Book id : 6495407
    Book title : Telecom Billing
    Book author : Yakit Singha
    Book subject : Telecom
    Book id : 6495700

Level2题解（11-20）

结构体指针