#include <stdio.h>

typedef struct point{
    int xpos;
    int ypos;
}Point;

void ShowPoint(Point p1, Point p2)
{
    printf("pos1: [%d, %d] \n", p1.xpos, p1.ypos);
    printf("pos2: [%d, %d] \n", p2.xpos, p2.ypos);
}

Point SwapPoint(Point *p1, Point *p2)
{
    Point temp = *p1;
    *p1 = *p2;
    *p2 = temp;
}

int main(void)
{
    Point pos1={2, 4};
    Point pos2={5, 7};

    SwapPoint (&pos1, &pos2);
    ShowPoint(pos1, pos2);
    return 0;
}