Recursion is one of the most powerful…
and confusing concepts in programming 😳
Let’s break it down in the simplest way possible.
Real-Life Example
Think of a Russian doll:
- You open one → another inside
- Open again → another inside
Same pattern repeats
This is exactly how recursion works.
What is Recursion?
Recursion is a technique where a function calls itself to solve a smaller version of the same problem.
Two Important Parts
Base Case
- Stops recursion
- Prevents infinite loop
Recursive Case
- Function calls itself
- Reduces problem size
Example: Factorial
public static int factorial(int n) {
// base case
if (n <= 1) return 1;
// recursive case
return n * factorial(n - 1);
}
How It Works
factorial(3)
= 3 * factorial(2)
= 3 * 2 * factorial(1)
= 3 * 2 * 1
= 6
Where Recursion is Used
- Trees
- Graphs
- Divide & Conquer
- Fibonacci
- Backtracking problems
For More: https://www.quipoin.com/tutorial/data-structure-with-java/recursion-introduction
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