1typedef struct {
2  int a, b, c, d, e, f;
3} A;
4
5void foo (A *v, int w, int x, int *y, int *z)
6{
7}
8
9void
10bar (A *v, int x, int y, int w, int h)
11{
12  if (v->a != x || v->b != y) {
13    int oldw = w;
14    int oldh = h;
15    int e = v->e;
16    int f = v->f;
17    int dx, dy;
18    foo(v, 0, 0, &w, &h);
19    dx = (oldw - w) * (double) e/2.0;
20    dy = (oldh - h) * (double) f/2.0;
21    x += dx;
22    y += dy;
23    v->a = x;
24    v->b = y;
25    v->c = w;
26    v->d = h;
27  }
28}
29
30int main ()
31{
32  A w = { 100, 110, 20, 30, -1, -1 };
33  bar (&w,400,420,50,70);
34  if (w.d != 70)
35    abort();
36  exit(0);
37}
38