结构体 typedef关键字

1 结构体
#include <iostream>
#include <cstring>
using namespace std;

void printBook( struct Book book );


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


int main()
{
    struct Book book1;
    struct Book book2;

    strcpy( book1.title, "Learn c++ Programming");
    strcpy( book1.author, "Chand Miyan");
    strcpy( book1.subject, "c++ Programming");
    book1.book_id = 6495407;

    strcpy( book2.title, "Telecom Billing");
    strcpy( book2.author, "Yakit Singha");
    strcpy( book2.subject, "Telecom");
    book2.book_id = 6495700;


    cout << book1.title << " " << book1.author << " " << book1.subject << " " << book1.book_id << endl;
    cout << book2.title << " " << book2.author << " " << book2.subject << " " << book2.book_id << endl;

    cout << "传入函数打印" << endl;


    printBook(book1);
    printBook(book2);

}

void printBook( struct Book book )
{
    cout << book.title << " " << book.author << " " << book.subject << " " << book.book_id << endl;
}


/* vim: set ts=4 sw=4 sts=4 tw=100 */

 

2 指向结构的指针
#include <iostream>
#include <cstring>

using namespace std;


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

void printBook(Book *book);

int main()
{
    Book book1, book2;

    strcpy( book1.title, "Learn c++ Programming");
    strcpy( book1.author, "Chand Miyan");
    strcpy( book1.subject, "c++ Programming");
    book1.book_id = 6495407;

    strcpy( book2.title, "Telecom Billing");
    strcpy( book2.author, "Yakit Singha");
    strcpy( book2.subject, "Telecom");
    book2.book_id = 6495700;

    printBook(&book1);
    printBook(&book2);


    long int a = 100;
    typedef long int *ptrLInt;
    
    ptrLInt x;
    x = &a;

    cout << *x;

}


void printBook(Book *book)
{
    //指向该结构的指针访问结构的成员，您必须使用 -> 运算符
    cout << book->title << " " << book->author << " " << book->subject << " " << book->book_id << endl;
}

/* vim: set ts=4 sw=4 sts=4 tw=100 */