Recursion

Definition of Recursion:

• Recursion is a method that calls itself.
• A method is recursive when it contains a call to itself.

Classic Example:
Factorial calculation is a classic example of recursion.
The factorial of a number? is the product of all integers from 1 to N

Code Example:

• Code provided shows a recursive method (factR) and an iterative method (factI) to calculate the factorial.
• Both methods return the same results, but with different approaches.

Working of the Recursive Method:

• The recursive method (factR) calls itself until the value of
• ? n be 1.
• With each recursive call, the method "stacks" and only starts returning when the base condition is met.

Call Stack:

• Each recursive call allocates space on the execution stack for new parameters and variables.
• Recursive calls can cause stack overrun, resulting in exceptions.

Comparison with Iteration:

• Recursive methods may be clearer and simpler for certain algorithms, such as quick sort.
• However, recursive versions may be slower due to method call overhead.

Care when Using Recursion:

• It is crucial to have a termination condition to prevent the method from entering an infinite loop.
• Debug statements such as println() can help you understand the flow of recursive execution.

Recursive Code to Calculate the Factorial
SEE RECURSION.JAVA

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