Occurence of a Character in a String..

Question

Can some one help me solving the following question in C# language? I apperiate your time in advance. I have input : abbcddbaa Ouput : a3b3c1d2

Helen · Answer

Thanks Alan, That was fantastic. Merry x-mas and have a great day!

Alan · Answer

OK, try this. All characters other than letters are ignored and no distinction is made between lower and upper case letters. The remaining characters are listed alphabetically followed by their frequency: using System; using System.Text; class Test { static void Main() { string input = "Helen is here"; string output = CountAllChars(input); Console.WriteLine(output); Console.ReadLine(); } static string CountAllChars(string s) { if (s == null) return null; if (s == "") return ""; s = s.ToLower(); char[] chars = s.ToCharArray(); Array.Sort(chars); StringBuilder sb = new StringBuilder(); int count = 0; for (int i = 0; i { if (chars[i] 'z') continue; if (sb.Length == 0) { sb = sb.Append(chars[i]); count = 1; } else if (chars[i] == chars[i-1]) { count++; } else { sb = sb.Append(count.ToString()); sb = sb.Append(chars[i]); count = 1; } } sb = sb.Append(count.ToString()); return sb.ToString(); } }

Helen · Answer

Thanks for replying to me Alan. My question here is not counting a,b,c,d....what if i gave another input this input(abbcdd) was just an example. I want a solution which works for every input string and returns occurrence of each character. Like i said earlier if i have input say( "Helen is here" ) output is gonna be H occurs 2 times e occurs 4 times l occurs 1 times n occurs 1 times i occurs 1 times s occurs 1 times r occurs 1 times and Out put CANNT BE like this H occurs 1times e occurs 1 times l occurs 1 times e occurs 1 times n occurs 1 times i occurs 1 times s occurs 1 times h occurs 1 times e occurs 1 times r occurs 1 times e occurs 1 times Thanks.

Alan · Answer

I think Helen wants to count the number of occurrences of a,b,c and d in the string and then output the result in string format. If so, then this is the sort of problem which is best dealt with using regular expressions but here's a way of doing it using conventional string parsing: using System; class Program { static void Main() { string input = "abbcddbaa"; int a = Count(input, 'a'); int b = Count(input, 'b'); int c = Count(input, 'c'); int d = Count(input, 'd'); string output = "a" + a.ToString() + "b" + b.ToString() + "c" + c.ToString() + "d" + d.ToString(); Console.WriteLine(output); Console.ReadLine(); } static int Count(string s, char c) { return s.Split(c).Length - 1; } }

Brandon Lewis · Answer

What do you mean? What are you trying to achieve?

Occurence of a Character in a String..

Answers (5)