Example: Program to calculate power using recursion
fun main(args: Array<String>) { val base = 3 val powerRaised = 4 val result = power(base, powerRaised) println("$base^$powerRaised = $result") } fun power(base: Int, powerRaised: Int): Int { if (powerRaised != 0) return base * power(base, powerRaised - 1) else return 1 } When you run the program, the output will be:
3^4 = 81
In the above program, you calculate the power using a recursive function power().
In simple terms, the recursive function multiplies the base with itself for powerRaised times, which is:
3 * 3 * 3 * 3 = 81
| Iteration | power() | powerRaised | result |
|---|---|---|---|
| 1 | power(3, 4) | 4 | 3 * result2 |
| 2 | power(3, 3) | 3 | 3 * 3 * result3 |
| 3 | power(3, 2) | 2 | 3 * 3 * 3 * result4 |
| 4 | power(3, 1) | 1 | 3 * 3 * 3 * 3 * resultfinal |
| Final | power(3, 0) | 0 | 3 * 3 * 3 * 3 * 1 = 81 |
Here's the equivalent Java code: Java Program to calculate power using recursion