letter sequense in a word

Question

hello for school i need to make a coding program. but i now ran in to the following problem: i need to get the letter sequense in a word.... like the word is: hello it needs to see that the e is the first letter from the alfabeth and the h the second ect. can anyone help me with solving this problem?? thanks!

Alan · Answer

That's a bit more difficult given that letters may be duplicated and the same letter may therefore map to different positions in the word but this should deal with it: using System; class Program { static void Main() { string word = hello; char[] chars = word.ToCharArray(); Array.Sort(chars); int[] usedIndices = new int[chars.Length]; for (int i = 0; i { usedIndices[i] = -1; } for (int i = 0; i { int index = -1; int index2 = -1; while(true) { index = word.IndexOf(chars[i] index + 1); index2 = Array.IndexOf(usedIndices index); if (index2 == -1) { usedIndices[i] = index; break; } } Console.WriteLine({0} is letter {1} in alphabet and letter {2} in word chars[i] i + 1 index + 1); } Console.ReadLine(); } }

nick van Alst · Answer

GREAT it is working :D thanks so much! Nick

nick van Alst · Answer

thanks for responding yes i tryed the sort befor but the problem is (maby i forgot to mension) i also still need to know where the letter is in the word like that e is the first letter in the alfabeth and stands on the second place.

Alan · Answer

If I've understood that correctly you just need to sort the characters in the array: using System; class Program { static void Main() { string word = hello; char[] chars = word.ToCharArray(); Array.Sort(chars); for (int i = 0; i { Console.WriteLine({0} is letter {1} chars[i] i + 1); } Console.WriteLine(); } } As a further refinement you could remove duplicates (such as the two l's in hello) though I haven't done it here.