It involves moving various sized rings or disks around on three poles. The Tower Of Hanoi is an ancient puzzle said to have originated in India or Vietnam. Zero! Recursion Example 2: Tower of Hanoi I think you’ll agree, this is an important feature of this recursion example. That way, as the counting backward happens, a corresponding number of emoji smiles will appear for each iteration. We also initialize a list and add a smiley emoji equal to the current number. In that case, we simply print Zero! If that condition is not met, the function calls itself using the current number – 2. The breaking condition is if the number is less than or equal to zero.
Here we have a function named backwardsby2, which prints numbers in reverse order using steps of 2 starting with an initial number. Recursion Example 1: Counting backward by 2 Each time a recursive function is called, the values of the arguments from the previous call are stored on the call stack. Having a step where the function actually finishes is known as a breaking condition. Otherwise, the recursive function will run forever, exhaust your memory, and crash your computer. That brings up a good point, and that is to make sure that your recursive function actually terminates and returns at some point. A recursive function just keeps calling itself until it has completed the problem at hand.
The recursion pattern appears in many scenarios in the real world, and we’ll cover some examples of recursion in Python here. You can think of it as another way to accomplish a looping construct. Recursion is the process of a function calling itself from within its own code.
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