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enum shape { circle { int r; }, rect { int w; int h; }, dot };
int area(shape* s) {
switch (s) {
case circle(r): return r * r * 3;
case rect(w, h): return w * h;
case dot: return 0;
}
return -1;
}
fn main() {
shape* s = shape.circle(3);
put_n(area(s)); put_c(10);
free(d*s);
shape* t = shape.rect(2, 5);
put_n(area(t)); put_c(10);
free(d*t);
return 0;
}
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