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