结构体复合字面量（C99)

语法：   　（结构类型）{初始化列表}；

 用法：可为一个结构变量提供多个可供替换的值；

 1 struct book{
 2           char title[20];
 3           char author[20];
 4           float value;
 5 };
 6 
 7 int main()
 8 {
 9     struct book readfirst;
10     int score;
11     scanf("%d",score);
12     if(score>=84)
13     {
14         readfirst=(struct book){"crime and punishment","Fyoder         
15                                             Dostoyevsky",11.25};   
16     }
17     else
18        readfirst=(struct book){"crime and punishment","Fyoder         
19                                             Dostoyevsky",5.99};