// Informatik - Serie 11 - Challenge 125
// Program: GersterBirgit.cpp
// Autor: Birgit Gerster
// Draw a Christmas tree
# include
# include
# include
// PRE: the input n>0
// POST: a Christmas tree is drawn
void furcation (unsigned j) {
if (j>0) {
ifm::forward ();
ifm::save();
ifm::right(225);
ifm::forward();
furcation (j/3);
ifm::restore();
ifm::save ();
ifm::left(225);
ifm::forward();
furcation (j/3);
ifm::restore();
furcation (j-1);
}
}
void length_trunk (int i) {
for(int n=i*3/10; n>0;--n) {
ifm::forward ();
}
}
void trunk (unsigned int i) {
if (i==0);
else{
ifm::right(90);
length_trunk (i);
ifm::left(179);
length_trunk(i);
}
}
int main () {
//Input
std::cout << "Number of iterations=?";
unsigned int n;
std::cin>> n;
//Check Input
assert (n>0);
// Draw Christmas tree
trunk (n);
ifm::right(90);
trunk (n);
furcation (n);
return 0;
}
