1 struct point
2 {
3     int x;
4     int y;
5 };

1 struct {...} x, y, z;

1 struct point minPoint = {0, 0};
2 //或者
3 struct point minPoint;
4 minPoint.x = 0;
5 minPoint.y = 0;

1 struct rect
2 {
3     struct point minPoint;
4     struct point maxPoint;
5 };

 1 struct point{
 2     int x;
 3     int y;
 4 } pt = {0, 0};
 5 //方式1
 6 void fn(int x, int y)
 7 {
 8     //coding
 9 }
10 
11 fn(pt.x, pt.y);
12 
13 //方式2
14 void fn(struct point point)
15 {
16     //coding
17 }
18 
19 fn(pt);
20 
21 //方式3
22 void fn(struct point *point)
23 {
24     //coding
25 }
26 
27 fn(&pt);

1 void fn(struct point *pt)
2 {
3     //方式1：
4     (*pt).x = 10;//括号是必须要的因为.的优先级比*高
5     (*pt).y = 20;
6     //方式2：
7     pt -> x = 10;
8     pt -> y = 20;
9 }