Question

编写一个接受字符数组作为输入的函数，计算数组中每个字符的出现次数，并以格式输出结果（例如{＆＃39; c＆＃39;，＆＃39; e＆＃ 39;，＆＃39; e＆＃39;，＆＃39;＆＃39; a＆＃39;，＆＃39; q＆＃39;}

a - *
c - *
e - ***
q - *

我再次尝试使用字典但是如何获得星号

    class Program
    {
    public static void Main()
    {
        char[] characters = { 'c', 'e', 'e', 'e', 'a', 'q' };
        charFuction(characters);
    }

    static Dictionary<char, int> occurrences = new Dictionary<char, int>();
    static void charFuction(char[] characters)
    {
        foreach(char c in characters)
        {
            if (occurrences.ContainsKey(c))
            {
                occurrences[c]++;
            }
            else
            {
                occurrences.Add(c, 1);
            }
        }
        foreach(char k in occurrences.Keys)
        {
            Console.WriteLine(k + " - " + occurrences[k]);
        }
    }

Answer 1

使用LINQ：

public static IEnumerable<string> GetCharCountPlaceholders(IEnumerable<char> chars, char placeholder = '*', string charCountDelimiter = " - ")
{
    return chars
        .GroupBy(c => c)
        .OrderBy(g => g.Key)
        .Select(g => String.Format("{0}{1}{2}"
         , g.Key
         , charCountDelimiter
         , new String(placeholder, g.Count())));
}

您可以通过这种方式调用它：

char[] chars = { 'c', 'e', 'e', 'e', 'a', 'q' };
string result = String.Join(Environment.NewLine, GetCharCountPlaceholders(chars));

a - *
c - *
e - ***
q - *

计算char数组中的出现次数

1 个答案: