Coding Test : find common character between two string

 Try to find common character with it's count between two strings and display it console.

Input:  string1: Dotnet , string2: Hotstar

Output:  o - 1, t - 2

  string str1 = "Dotnet";

  string str2 = "Hotstar";

  List<char> lst1 = str1.ToList();

  List<char> lst2 = str2.ToList();

  Dictionary<char, int> commonCharsDic = new Dictionary<char, int>();

  foreach (char c in lst1)

  {

      if (lst2.Contains(c))

      {

          int val;

          if (commonCharsDic.TryGetValue(c, out val))

              commonCharsDic[c] = val + 1;

          else

              commonCharsDic.Add(c, 1);

          lst2.Remove(c);

      }

  }

  foreach (var item in commonCharsDic)

      Console.WriteLine("{0}-{1}", item.Key, item.Value);

 // Output: o-1 , t-2

below is another similar logic

  string str1 = "Dotnet";

  string str2 = "Hotstar";

  List<char> lst1 = str1.ToList();

  List<char> lst2 = str2.ToList();

 

  var res2 = lst1.Intersect(lst2).ToList();

  Dictionary<char, int> dict = new Dictionary<char, int>();

  foreach (var item in res2)

      dict.Add(item, 0);

  foreach (var item in lst1)

  {

      if (lst2.Contains(item))

          dict[item] = dict[item] + 1;

      lst2.Remove(item);

  }

  foreach (var item in dict)

      Console.WriteLine("{0}-{1}", item.Key, item.Value);

 // Output: o-1 , t-2