How to count how many times a certain letter is input into c#

Question

I am trying to figure out how to count how many times someone enters one of three letters so I can then display the count.

I am trying to do this in c# visual studio.

for example if someone has to register into a sport where R = running, C = cricket or B = boxing they enter a letter corresponding with the sport they are registering into, then the next person enters a letter for their sport and so on. how do i track the letters entered and display how many times each one has been entered.

thanks for any help I cant seem to find what im looking for anywhere,

Answer 1

There are many ways to achieve this task, Here is a starting point in one way.
You can create a method (AddCounts()) that accepts a letter as a parameter and advances the count into a globally declared dictionary.

 static void Main(string[] args)
 {
     for (int i = 0; i < 5; i++)
     {
         Console.WriteLine("Enter one Letter and press enter");
         var letter = Console.ReadLine();
         if (letter.Length > 0)
         {   
             AddCounts(letter);
         }
     }

   PrintOutput();
   Console.ReadLine();
 }


 static Dictionary<string, int> LettersCountDictionary = new Dictionary<string, int>();
 public static void AddCounts(string letter)
 {
     if (LettersCountDictionary.ContainsKey(letter))
     {
         LettersCountDictionary[letter]++;
     }
     else
     {
         LettersCountDictionary.Add(letter, 1);
     }
 }

 private static void PrintOutput()
 {
     foreach (KeyValuePair<string, int> itm in LettersCountDictionary)
     {
         Console.WriteLine("Letter: {0} Count: {1}", itm.Key, itm.Value);
     }
 }