#include <stdio.h>
#include <math.h>

struct point
{
    int xpos;
    int ypos;
    struct point * ptr;
};

int main()
{
    struct point pos1={1,1};
    struct point pos2={2,2};
    struct point pos3={3,3};

    pos1.ptr = &pos2;
    pos2.ptr = &pos3;
    pos3.ptr = &pos1;

    printf("점의 연결관계... \n");
    printf("[%d, %d]와(과) [%d, %d] 연결 \n",
        pos1.xpos, pos1.ypos, pos1.ptr->xpos, pos1.ptr->ypos);
    printf("[%d, %d]와(과) [%d, %d] 연결 \n",
        pos2.xpos, pos2.ypos, pos2.ptr->xpos, pos2.ptr->ypos);
    printf("[%d, %d]와(과) [%d, %d] 연결 \n",
        pos3.xpos, pos3.ypos, pos3.ptr->xpos, pos3.ptr->ypos);
    return 0;
        
}