# Kotlin Program to Calculate the Power of a Number

#### In this program, you’ll learn to calculate the power of a number with and without using pow() function.

## Example 1: Calculate power of a number without using pow()

```
fun main(args: Array<String>) {
val base = 3
var exponent = 4
var result: Long = 1
while (exponent != 0) {
result *= base.toLong()
--exponent
}
println("Answer = $result")
}
```

When you run the program, the output will be:

Answer = 81

In this program, `base` and `exponent` are assigned values 3 and 4 respectively.

Using the while loop, we keep on multiplying `result` by `base` until `exponent` becomes zero.

In this case, we multiply `result` by base 4 times in total, so `result` = 1 * 3 * 3 * 3 * 3 = 81. We also need to cast `base` to `Long`

because `result` only accepts `Long`

and Kotlin focuses on type safety.

However, as in Java, above code doesn’t work if you have a negative exponent. For that, you need to use pow() function in Kotlin

## Example 2: Calculate power of a number using pow()

```
fun main(args: Array<String>) {
val base = 3
val exponent = -4
val result = Math.pow(base.toDouble(), exponent.toDouble())
println("Answer = $result")
}
```

When you run the program, the output will be:

Answer = 0.012345679012345678

In this program, we used standard library function Math.pow() to calculate the power of base.

We also need to convert `base` and `exponent` to `Double`

because, pow only accepts `Double`

parameters.

# Python Example for Beginners

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There are two sides to machine learning:

**Practical Machine Learning:**This is about querying databases, cleaning data, writing scripts to transform data and gluing algorithm and libraries together and writing custom code to squeeze reliable answers from data to satisfy difficult and ill defined questions. It’s the mess of reality.**Theoretical Machine Learning**: This is about math and abstraction and idealized scenarios and limits and beauty and informing what is possible. It is a whole lot neater and cleaner and removed from the mess of reality.

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