CS153/hw6/oatprograms/fac.oat

int f(int i) {
  var r = 0;
  if (i == 0) {
    r = 1;
  } else {
    r = i * f (i-1);
  }
  return r; 
}

int program (int argc, string[] argv) {
  return f (5);
}