我必须计算一个特定角色的出现次数.我能做些什么?

问题描述

我必须计算一个特定角色的出现次数.我该怎么办?

I have to count the number of occurances of a particular character. What can i do?

推荐答案

using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace CountCharacters
{
    static class Program
    {
        static void Main()
        {
            Dictionary<Char, int> countChars = new Dictionary<Char,int>();
            String test = "Hello man how''s it going. Some characters here in this string. Some stuff to test our character counter with.";
            foreach (Char ch in test)
            {
                if(countChars.ContainsKey(ch))
                {
                    countChars[ch]++;
                }
                else
                {
                    countChars.Add(ch, 1);
                }
            }
            List<CharInt> list = new List<CharInt>();
            foreach (Char key in countChars.Keys)
            {
                list.Add(new CharInt(key, countChars[key]));
            }
            list.Sort();
            foreach (CharInt ci in list)
            {
                Console.WriteLine("{0} : {1}", ci.Char, ci.Int);
            }
            Console.ReadLine();
        }

        private class CharInt : IComparable<CharInt>
        {
            public Char Char;
            public int Int;
            public CharInt(Char c, int i)
            {
                this.Char = c;
                this.Int = i;
            }
            public int CompareTo(CharInt other)
            {
                if (other == null) return 1;
                return -1 * this.Int.CompareTo(other.Int);
            }
        }
    }
}

干杯！

—MRB

Cheers!

—MRB

char [ ] sep = {'i'};
string s = "how many 'i's are in this string?";
int count =  s.Split(sep).Length - 1;

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