Data Structures and Algorithms The Complete Masterclass - What is Recursion?

The video tutorial introduces the concept of recursion, emphasizing its definition as a function that calls itself. It highlights the importance of a base case to prevent infinite loops. An example using a 'Hello World' function demonstrates recursion, showing how it can lead to infinite loops without a base case. The tutorial explains Python's default recursion limit and how to implement a base case to control recursion. The video concludes with a recap of key points, stressing the necessity of defining a base case in recursive functions.

What is the primary characteristic of a recursive function?

• It never stops.

• It runs indefinitely.

• It calls other functions.

• It calls itself.

In the 'Hello World' recursion example, what issue arises without a base case?

• The function will enter an infinite loop.

• The function will print only once.

• The function will stop after 10 iterations.

• The function will not print anything.

What is the default recursion limit in Python?

• Unlimited

• 2000

• 1000

• 500

Why is a base case crucial in a recursive function?

• To ensure the function runs faster.

• To prevent the function from calling itself indefinitely.

• To make the function more complex.

• To allow the function to call other functions.

What happens if a recursive function exceeds the default recursion limit in Python?

• It will continue running indefinitely.

• It will stop and raise an error.

• It will reset and start over.

• It will automatically add a base case.

How can you stop a recursive function after a certain number of iterations?

• By using a while loop.

• By setting a base case.

• By calling another function.

• By using a for loop.

In the context of recursion, what is a base case?

• The initial call to the function.

• The condition where the function stops calling itself.

• The maximum number of times a function can call itself.

• The first line of the function.