String

Question

Hello,

Given the code below, how do reduce the code to only display the total count of lower case a and upper case A?

using

System;

using

System.Text;

class

Test

{

   

static void Main()

    {

       

string input = " In this assignment, I need to count all occurence of lower cAse a and upper case A";

       

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 < chars.Length; i++)

        {

           

if (chars[i] < 'a' || 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();

    }

}