Python Program to Find Sum of Natural Numbers Using Recursion.

# Python program to find the sum of natural using recursive function
def recur_sum(n):
   if n <= 1:
       return n
   else:
       return n + recur_sum(n-1)
# change this value for a different result
num = 16
if num < 0:
   print("Enter a positive number")
else:
   print("The sum is",recur_sum(num))