Kotlin Program to Calculate the Power of a Number

In this article, we will understand how to calculate the power of a number. The calculate the power of a number is calculated using a loop and multiplying it by itself multiple times.

Below is a demonstration of the same ?

Suppose our input is ?

Number : 4
Exponent value : 5

The desired output would be ?

The result is 1024

Algorithm

• Step 1 ? START

• Step 2 ? Declare three integer values namely baseValue, exponentValue and and myResult

• Step 3 ? Define the values

• Step 4 ? Using a while loop, multiply the input value with itself for n number of times where n is the exponent value. Store the result.

• Step 5 ? Display the result

• Step 6 ? Stop

Example 1

In this example, we will calculate the power of a number using a while loop. First, let us declare and initialize the required variables, including the base and exponent value.

val baseValue = 4
var exponentValue = 5
var myResult: Long = 1

Now, use a while loop to calculate the result i.e. the power of a number ?

while (exponentValue != 0) {
   myResult *= baseValue.toLong()
   --exponentValue
}

Let us now see the complete example to calculate the power of a number ?

<div class="execute"></div><div class="code-mirror  language-kotlin" contenteditable="plaintext-only" spellcheck="false" style="outline: none; overflow-wrap: break-word; overflow-y: auto; white-space: pre-wrap;"><span class="token keyword">fun</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token keyword">val</span> baseValue <span class="token operator">=</span> <span class="token number">4</span>
   <span class="token keyword">var</span> exponentValue <span class="token operator">=</span> <span class="token number">5</span>
   <span class="token keyword">var</span> myResult<span class="token operator">:</span> Long <span class="token operator">=</span> <span class="token number">1</span>

   <span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"The baseValue value and the exponentValue are defined as <span class="token interpolation variable">$baseValue</span> and <span class="token interpolation variable">$exponentValue</span> respectively"</span><span class="token punctuation">)</span>

   <span class="token keyword">while</span> <span class="token punctuation">(</span>exponentValue <span class="token operator">!=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      myResult <span class="token operator">*=</span> baseValue<span class="token punctuation">.</span><span class="token function">toLong</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token operator">--</span>exponentValue
   <span class="token punctuation">}</span>
   <span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"The result is: <span class="token interpolation variable">$myResult</span>"</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</div><div class="output-wrapper"><div class="console-close"></div><div class="code-output"></div></div>

Output

The baseValue value and the exponentValue are defined as 4 and 5 respectively
The result is: 1024

Example 2

In this example, we will calculate the power of a number ?

<div class="execute"></div><div class="code-mirror  language-kotlin" contenteditable="plaintext-only" spellcheck="false" style="outline: none; overflow-wrap: break-word; overflow-y: auto; white-space: pre-wrap;"><span class="token keyword">fun</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token keyword">val</span> baseValue <span class="token operator">=</span> <span class="token number">4</span>
   <span class="token keyword">var</span> exponentValue <span class="token operator">=</span> <span class="token number">5</span>
   <span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"The baseValue value and the exponentValue are defined as <span class="token interpolation variable">$baseValue</span> and <span class="token interpolation variable">$exponentValue</span> respectively"</span><span class="token punctuation">)</span>
   <span class="token function">power</span><span class="token punctuation">(</span>baseValue<span class="token punctuation">,</span> exponentValue<span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token keyword">fun</span> <span class="token function">power</span><span class="token punctuation">(</span>input1<span class="token operator">:</span> Int<span class="token punctuation">,</span> input2<span class="token operator">:</span> Int<span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token keyword">val</span> baseValue <span class="token operator">=</span> input1
   <span class="token keyword">var</span> exponentValue <span class="token operator">=</span> input2
   <span class="token keyword">var</span> myResult<span class="token operator">:</span> Long <span class="token operator">=</span> <span class="token number">1</span>
   
   <span class="token keyword">while</span> <span class="token punctuation">(</span>exponentValue <span class="token operator">!=</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      myResult <span class="token operator">*=</span> baseValue<span class="token punctuation">.</span><span class="token function">toLong</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token operator">--</span>exponentValue
   <span class="token punctuation">}</span>
   <span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"The result is: <span class="token interpolation variable">$myResult</span>"</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</div><div class="output-wrapper"><div class="console-close"></div><div class="code-output"></div></div>

Output

The baseValue value and the exponentValue are defined as 4 and 5 respectively
The result is: 1024