c语言结构体和联合体例题

第一题：
要求你设计一个能够保存图书信息的结构。图书属性包括：书名（title）、作者（author）和单价信息（

price），并按照下面要求完成对于各种图书的相关操作。
/*
 struct books {
 char title[100];
 char author[20];
 double price;
 } doyle = { "My life as a budgie", "Mack Tom", 14.6 };
 int main(void) {
 struct books dicken = { "Thinking in C++", "Stephen Prata", 78 };
 struct books panshin = { .title = "C++ Primer", .author = "Stanley Lippman",
 .price = 92.5 };

 printf("The title is :%s\nThe author is :%s\nThe price is :%lf\n",
 doyle.title, doyle.author, doyle.price);
 printf("\n");
 printf("The title is :%s\nThe author is :%s\nThe price is :%lf\n",
 dicken.title, dicken.author, dicken.price);
 printf("\n");
 printf("The title is :%s\nThe author is :%s\nThe price is :%lf\n",
 panshin.title, panshin.author, panshin.price);
 printf("\n");
 printf("“Thinking in C++”这本书的价格调整后为：\n");
 printf("\n");
 printf("The title is :%s\nThe author is :%s\nThe price is :%lf\n",
 dicken.title, dicken.author, dicken.price = 85);
 return EXIT_SUCCESS;
 }
 */

第二题：
为上面的关于图书的程序，添加三个函数：
/*(1)编写显示图书信息函数show()。参数为结构的指针。显示图书信息的结构如下：
The title is :My life as a budgie
The author is :Mack Tom
The price is :14.6

#include <stdio.h>
#include <stdlib.h>

struct Library {
 const char title[20];
 const char author[10];
 double price;
} panshin;

void show(struct Library *doy) {

 printf("The title is: %s\n The author is : %s\n The price is : %.1lf",doy->title,

doy->author, doy->price);
}

int main(void) {

 struct Library doyle = { "My life as a budgie", "Mack Tom", 14.6 };
 show(&doyle);
 return EXIT_SUCCESS;
}*/
/*(2)编写初始化结构变量函数init()，参数为结构的指针。函数功能是将结构变量中的成员进行初始化。

#include <stdio.h>
#include <stdlib.h>

struct Library {
 const char title[20];
 const char author[10];
 double price;
} panshin;

void init(struct Library *doyle, struct Library *dicken, struct Library *panshin) {
 doyle ->title;
 dicken ->author;
 panshin ->price;

}
int main(void) {

 struct Library doyle = { "My life as a budgie", "Mack Tom", 14.6 };
 struct Library dicken ={ "Thinking in C++", "Stephen Prata", 78 };
 struct Library panshin = { "C++ Prinner", "Stanley Lippman", 92.5 };
 init(&doyle,&dicken,&panshin);
 printf("The title is: %s\n The author is : %s\n The price is : %.1lf",
    doyle->title, doyle->author, doyle->price);
 printf("The title is: %s\n The author is : %s\n The price is : %.1lf",
    dicken->title, dicken->author, dicken->price);
 printf("The title is: %s\n The author is : %s\n The price is : %.1lf",
    panshin->title, panshin->au