[C++]结构体的学习

1.定义

结构体是自定义类型的一种，是cpp提供扩展自定义类型的一种方式。

2.声明

结构体的声明方式有2种：

第一种是：

struct user_type { type name; type name1; type name2; }variables;//variables可有可无

第二种是：

type struct{ type name; type name1; type name2; } user_type;

3.实例

#include <iostream> #include <ctime> #include <cstring> using namespace std; typedef struct{ int book_id; char book_title[10]; char book_description[100]; time_t book_pubtime; } Book; //struct Book{ // int book_id; // char book_title[10]; // char book_description[100]; // time_t book_pubtime; //}book; int main(int argc, char *argv[]) { book.book_id=12; strcpy(book.book_title,"book_title"); strcpy(book.book_description,"book_description"); book.book_pubtime=time(0); cout<<"book_id:"<<book.book_id <<endl; cout<<"book_title:"<<book.book_title <<endl; cout<<"book_description:"<<book.book_description <<endl; cout<<"book_pubtime:"<<ctime(&book.book_pubtime)<<endl; return 0; }

4.补充

结构体变量的声明：struct user_type name;或者user_type name; 结构体指针变量的声明：struct user_type* name;