In our **R** class we learnt about recursive functions that produce a sequence of numbers upto a given number say $n$ as demonstrated in the following codes.

```{r} foo <- function(x){ print(x) if(x>1) foo(x-1) }

moo <- function(x){ if(x>1) moo(x-1) print(x) }

foo(3) moo(3) ```

Explain why function ``moo()`` prints 1 through 3 while function ``foo()`` prints from 3 through 1.