学步园

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace The_experiment__of__three__week
{
    class Program
    {
        static void Main(string[] args)
        {
            MyClass m = new MyClass();

            int t1 = m.CountChar("dsfagaasdsfafa", 's');

            Console.WriteLine(t1);

             m.Reconvert("dsfagaasdsfafa");

            

            Console.ReadKey();



        }
    }
    class MyClass
    {
        public int CountChar(string s, char c)
        {
            char[] str = new char[322];

            str = s.ToCharArray();

            int t = 0;
            for (int i = 0; i < str.Length; i++)
            {
                if (str[i] == c)
                {


                    t++;
                }


            }
            return t;

        }

 

 public void Reconvert(string s)  
         {  
             char[] sr = s.ToCharArray();  
              
             char[] sr1 = new char[100];
             int j = sr.Length-1;
           
             for (int i= 0; i < sr.Length; i++)  
             {  
                 sr1[j] = sr[i];

                 
                 j--;
             }

             foreach (char l in sr1)
             {
                 Console.Write(l);

             }    
             
         }  

        }
    }