C#入门变编程

static void Main()
        {
            int sum = 0;
            int ccc = 0;
            string a = Console.ReadLine();
            for (int i = 0; i < a.Length ; i++)
            {
                sum = 0;
                bool boo = false;
                for (int q = 0; q < a.Length ; q++)
                {

                  if (a[i] == a[q])
                  {
                      for (int k = 0; k <i; k++)
                      {
                          if (a[k] == a[i])
                          {
                                 boo = true;
                                  break;
                          }
                      }
                      if (boo)
                      {
                            break;
                      }

                       sum++;
                        ccc++;
                  }
                }
                if (!boo)
                {
                    Console.WriteLine("字符串{0}中{1}出现{2}次",a,a[i],sum );
                    
                }
            
            }
            Console.WriteLine("共计重复{0}次", ccc);


        }