In the previous code sample, we calculated the complexity of the iterative method. Now, let's do this with the recursive method. Suppose we need to calculate the factorial of a certain number, for instance 6, which will produce 6 * 5 * 4 * 3 * 2 * 1 = 720. For this purpose, we can use the recursive method, which is shown in the following code snippet:
int Factorial(int n){ if(n == 1) return 1; return n * Factorial(n - 1);}
For the preceding function, we can calculate the complexity similarly to how we did for the iterative method, which is f(n) = n since it depends on how much data is being processed (which is n). We can use a constant, for instance c, to calculate the lower bound and the upper bound.
