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<blockquote data-quote="EKGuest" data-source="post: 28430274" data-attributes="member: 582168">I had already coded the solution at the time I made my previous post asking for the constraints so that I could modify my code to suit the constraints. Anyway here is the solution that works for both capital and simple letters and supports multiple numbers within the sentence.[CODE=csharp]using System;using System.Linq;public class Program{&nbsp; &nbsp; const int NO_OF_SENTENCES = 5;&nbsp; &nbsp; static void Main(string[] args)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; string[] sentences = ReadSentences();&nbsp; &nbsp; &nbsp; &nbsp; string[] encodedSentences = EncodeSentences(sentences);&nbsp; &nbsp; &nbsp; &nbsp; WriteEncodedSentences(sentences, encodedSentences);&nbsp; &nbsp; &nbsp; &nbsp; Console.ReadLine();&nbsp; &nbsp; }&nbsp; &nbsp; static string[] EncodeSentences(string[] sentences)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; string[] encodedSentences = new string[sentences.Length];&nbsp; &nbsp; &nbsp; &nbsp; for (int i = 0; i &lt; sentences.Length; i++)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; encodedSentences[i] = EncodeSentence(sentences[i]);&nbsp; &nbsp; &nbsp; &nbsp; return encodedSentences;&nbsp; &nbsp; }&nbsp; &nbsp; static string EncodeSentence(string sentence)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; string encoded = &quot;&quot;;&nbsp; &nbsp; &nbsp; &nbsp; string number = &quot;&quot;;&nbsp; &nbsp; &nbsp; &nbsp; for (int i = 0; i &lt; sentence.Length; i++)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (Char.IsDigit(sentence[i]))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; number = sentence[i] + number;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; else&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (number != &quot;&quot;)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; encoded += int.Parse(number) * 2;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; number = &quot;&quot;;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; encoded += GetEncodedLetter(sentence[i]);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; return encoded;&nbsp; &nbsp; }&nbsp; &nbsp; static string GetEncodedLetter(char c)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; string vowels = &quot;AEIOU&quot; + &quot;AEIOU&quot;;&nbsp; &nbsp; &nbsp; &nbsp; string consonants = &quot;BCDFGHJKLMNPQRSTVWXYZ&quot; + &quot;BCDFGHJKLMNPQRSTVWXYZ&quot;;&nbsp; &nbsp; &nbsp; &nbsp; if (Char.IsLower(c))&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; vowels = vowels.ToLower();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; consonants = consonants.ToLower();&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; if (vowels.Contains(c))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return &quot;&quot; + vowels[vowels.LastIndexOf(c) - 2];&nbsp; &nbsp; &nbsp; &nbsp; else if (consonants.Contains(c))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return &quot;&quot; + consonants[consonants.IndexOf(c) + 3];&nbsp; &nbsp; &nbsp; &nbsp; else if (&quot;.!?&quot;.Contains(c))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return &quot;#&quot;;&nbsp; &nbsp; &nbsp; &nbsp; else if (Char.IsDigit(c))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return &quot;&quot; + c;&nbsp; &nbsp; &nbsp; &nbsp; else if (c == ' ')&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return &quot; &quot;;&nbsp; &nbsp; &nbsp; &nbsp; else // Must be some other punctuation mark&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return &quot;&quot;;&nbsp; &nbsp; }&nbsp; &nbsp; static string[] ReadSentences()&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; string[] sentences = new string[NO_OF_SENTENCES];&nbsp; &nbsp; &nbsp; &nbsp; for (int i = 0; i &lt; sentences.Length; i++)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Console.Write(&quot;\nInput sentence No. {0}: &quot;, i + 1);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sentences[i] = Console.ReadLine();&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; return sentences;&nbsp; &nbsp; }&nbsp; &nbsp; static void WriteEncodedSentences(string[] sentences, string[] encodedSentences)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; Console.WriteLine(&quot;\n&quot;);&nbsp; &nbsp; &nbsp; &nbsp; for (int i = 0; i &lt; sentences.Length; i++)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Console.WriteLine(&quot;Sentence: {0}&quot;, sentences[i]);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Console.WriteLine(&quot;Encoded Sentence: {0}\n&quot;, encodedSentences[i]);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }}[/CODE]<img src="https://i.ibb.co/xChXB76/1.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="EKGuest, post: 28430274, member: 582168"] I had already coded the solution at the time I made my previous post asking for the constraints so that I could modify my code to suit the constraints. Anyway here is the solution that works for both capital and simple letters and supports multiple numbers within the sentence. [CODE=csharp]using System; using System.Linq; public class Program { const int NO_OF_SENTENCES = 5; static void Main(string[] args) { string[] sentences = ReadSentences(); string[] encodedSentences = EncodeSentences(sentences); WriteEncodedSentences(sentences, encodedSentences); Console.ReadLine(); } static string[] EncodeSentences(string[] sentences) { string[] encodedSentences = new string[sentences.Length]; for (int i = 0; i < sentences.Length; i++) encodedSentences[i] = EncodeSentence(sentences[i]); return encodedSentences; } static string EncodeSentence(string sentence) { string encoded = ""; string number = ""; for (int i = 0; i < sentence.Length; i++) { if (Char.IsDigit(sentence[i])) number = sentence[i] + number; else { if (number != "") { encoded += int.Parse(number) * 2; number = ""; } encoded += GetEncodedLetter(sentence[i]); } } return encoded; } static string GetEncodedLetter(char c) { string vowels = "AEIOU" + "AEIOU"; string consonants = "BCDFGHJKLMNPQRSTVWXYZ" + "BCDFGHJKLMNPQRSTVWXYZ"; if (Char.IsLower(c)) { vowels = vowels.ToLower(); consonants = consonants.ToLower(); } if (vowels.Contains(c)) return "" + vowels[vowels.LastIndexOf(c) - 2]; else if (consonants.Contains(c)) return "" + consonants[consonants.IndexOf(c) + 3]; else if (".!?".Contains(c)) return "#"; else if (Char.IsDigit(c)) return "" + c; else if (c == ' ') return " "; else // Must be some other punctuation mark return ""; } static string[] ReadSentences() { string[] sentences = new string[NO_OF_SENTENCES]; for (int i = 0; i < sentences.Length; i++) { Console.Write("\nInput sentence No. {0}: ", i + 1); sentences[i] = Console.ReadLine(); } return sentences; } static void WriteEncodedSentences(string[] sentences, string[] encodedSentences) { Console.WriteLine("\n"); for (int i = 0; i < sentences.Length; i++) { Console.WriteLine("Sentence: {0}", sentences[i]); Console.WriteLine("Encoded Sentence: {0}\n", encodedSentences[i]); } } }[/CODE] [IMG]https://i.ibb.co/xChXB76/1.png[/IMG] [/QUOTE]

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