#include <stdio.h>

typedef struct {
 int x;
 int y;

} point;

void clearPoint(point *p) {
   (*p).x=0; (*p).y=0;
}
void setPoint(point *p) {
   p->x = 10;
   p->y = 11;
}

void printPoint(point p) {
  printf("(%d,%d)\n",p.x, p.y);
}

point invert(point p) {
 int s;
  s = p.x;
  p.x = p.y;
  p.y = s;
  return p;
}

int main() {

point a,b;

clearPoint(&a);
printPoint(a);
setPoint(&a);
printPoint(a);

b=a;
printPoint(b);

b = invert(a);
printPoint(b);
printPoint(a);


return 0;
}