n
, which specifies the number of natural numbers to sum.n
natural numbers.n
from the user.n
and sum them.n
, and keep adding them to a sum variable.n
).1
to n
.n
until n
becomes 0 or 1, and then sums up the values.recur_sum(n)
that:n
when n
is 1 or 0 (base case).n
and the result of recur_sum(n-1)
(recursive case).n
input by the user.n
.n
due to potential stack overflow issues if the recursion depth is too large.