Recursive and Iterative
Solving problems with iterative and recursive methods are two quite different approaches, somehow, to the same kind of problems.
Here we will calculate the factorial of $n$. We define two functions using the iterative method and the recursive method.
Run the program on Repl.it.
def recursiveFactorial(n): if n == 0: return 1 else: return n * recursiveFactorial(n - 1) def iterativeFactorial(n): ans = 1 i=1 while i <= n: ans = ans * i i=i+1 return ans print(recursiveFactorial(0)) print(iterativeFactorial(0))