Kotlin Program to Count the Number of Vowels and Consonants in a Sentence

In this article, we will understand how to count the vowels and consonants in Kotlin. Alphabets that include the following are called Vowels ?

?a? ?e? ?i? ?o? ?u?

All other alphabets are called Consonants.

Suppose our input is ?

Hello, my name is Charlie

The desired output would be ?

The number of vowels in the statement is: 8
The number of vowels in the Consonants is: 12

Algorithm

• Step 1 ? Start

• Step 2 ? Declare two integers: vowelsCount, consonantsCount and a string input

• Step 3 ? Define the values

• Step 4 ? Run a for-loop, check each letter whether it is a consonant or a vowel. Increment the respective integer. Store the value.

• Step 5 ? Display the result

• Step 6 ? Stop

Example 1

In this example, we will count the Number of Vowels and Consonants in a Sentence using a for loop. First, declare and set the input string

var myInput = "Hello, my name is Charlie"

Now, set the variables for vowels and consonants and initialize to zero

var vowelsCount = 0
var consonantsCount = 0

Count the vowels and consonants

<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;">myInput <span class="token operator">=</span> myInput<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>i <span class="token keyword">in</span> <span class="token number">0</span><span class="token operator">..</span>myInput<span class="token punctuation">.</span>length <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token keyword">val</span> ch <span class="token operator">=</span> myInput<span class="token punctuation">[</span>i<span class="token punctuation">]</span>
   <span class="token keyword">if</span> <span class="token punctuation">(</span>ch <span class="token operator">==</span> <span class="token string">'a'</span> <span class="token operator">||</span> ch <span class="token operator">==</span> <span class="token string">'e'</span> <span class="token operator">||</span> ch <span class="token operator">==</span> <span class="token string">'i'</span>
      <span class="token operator">||</span> ch <span class="token operator">==</span> <span class="token string">'o'</span> <span class="token operator">||</span> ch <span class="token operator">==</span> <span class="token string">'u'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token operator">++</span>vowelsCount
   <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>ch <span class="token keyword">in</span> <span class="token string">'a'</span><span class="token operator">..</span><span class="token string">'z'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token operator">++</span>consonantsCount
   <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</div>

Let us now see the complete example to count the number of vowels and consonants using a for loop

<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">var</span> myInput <span class="token operator">=</span> <span class="token string">"Hello, my name is Charlie"</span>
   <span class="token keyword">var</span> vowelsCount <span class="token operator">=</span> <span class="token number">0</span>
   <span class="token keyword">var</span> consonantsCount <span class="token operator">=</span> <span class="token number">0</span>
   <span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"The statement is defined as: <span class="token interpolation variable">$myInput</span> "</span><span class="token punctuation">)</span>
   myInput <span class="token operator">=</span> myInput<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

   <span class="token keyword">for</span> <span class="token punctuation">(</span>i <span class="token keyword">in</span> <span class="token number">0</span><span class="token operator">..</span>myInput<span class="token punctuation">.</span>length <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">val</span> ch <span class="token operator">=</span> myInput<span class="token punctuation">[</span>i<span class="token punctuation">]</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>ch <span class="token operator">==</span> <span class="token string">'a'</span> <span class="token operator">||</span> ch <span class="token operator">==</span> <span class="token string">'e'</span> <span class="token operator">||</span> ch <span class="token operator">==</span> <span class="token string">'i'</span>
         <span class="token operator">||</span> ch <span class="token operator">==</span> <span class="token string">'o'</span> <span class="token operator">||</span> ch <span class="token operator">==</span> <span class="token string">'u'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
         <span class="token operator">++</span>vowelsCount
      <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>ch <span class="token keyword">in</span> <span class="token string">'a'</span><span class="token operator">..</span><span class="token string">'z'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
         <span class="token operator">++</span>consonantsCount
      <span class="token punctuation">}</span>
   <span class="token punctuation">}</span>
   <span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"The vowel count is: <span class="token interpolation variable">$vowelsCount</span>"</span><span class="token punctuation">)</span>
   <span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"The consonants count is: <span class="token interpolation variable">$consonantsCount</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 statement is defined as: Hello, my name is Charlie
The vowel count is: 8
The consonants count is: 12

Example 2

In this example, we will to count the Number of Vowels and Consonants in a Sentence ?

<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">var</span> myInput <span class="token operator">=</span> <span class="token string">"Hello, my name is Charlie"</span>
   <span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"The statement is defined as: <span class="token interpolation variable">$myInput</span> "</span><span class="token punctuation">)</span>
   <span class="token function">count</span><span class="token punctuation">(</span>myInput<span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token keyword">fun</span> <span class="token function">count</span><span class="token punctuation">(</span>input<span class="token operator">:</span> String<span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token keyword">var</span> myInput <span class="token operator">=</span> input
   <span class="token keyword">var</span> vowelsCount <span class="token operator">=</span> <span class="token number">0</span>
   <span class="token keyword">var</span> consonantsCount <span class="token operator">=</span> <span class="token number">0</span>
   
   myInput <span class="token operator">=</span> myInput<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
   <span class="token keyword">for</span> <span class="token punctuation">(</span>i <span class="token keyword">in</span> <span class="token number">0</span><span class="token operator">..</span>myInput<span class="token punctuation">.</span>length <span class="token operator">-</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token keyword">val</span> ch <span class="token operator">=</span> myInput<span class="token punctuation">[</span>i<span class="token punctuation">]</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>ch <span class="token operator">==</span> <span class="token string">'a'</span> <span class="token operator">||</span> ch <span class="token operator">==</span> <span class="token string">'e'</span> <span class="token operator">||</span> ch <span class="token operator">==</span> <span class="token string">'i'</span>
      <span class="token operator">||</span> ch <span class="token operator">==</span> <span class="token string">'o'</span> <span class="token operator">||</span> ch <span class="token operator">==</span> <span class="token string">'u'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
         <span class="token operator">++</span>vowelsCount
      <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>ch <span class="token keyword">in</span> <span class="token string">'a'</span><span class="token operator">..</span><span class="token string">'z'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
         <span class="token operator">++</span>consonantsCount
      <span class="token punctuation">}</span>
   <span class="token punctuation">}</span>
   
   <span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"The vowel count is: <span class="token interpolation variable">$vowelsCount</span>"</span><span class="token punctuation">)</span>
   <span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"The consonants count is: <span class="token interpolation variable">$consonantsCount</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 statement is defined as: Hello, my name is Charlie
The vowel count is: 8
The consonants count is: 12