结构体示例: struct Student { int id; int age; float score; };

创建变量 struct Student s1;

访问和修改 s1.id = 1001; s1.age = 19; s1.score = 85.5f;

printf("%d\n", s1.age);

不同的定义方式 typedef struct { int data[100]; int length; } SeqList;