namespace 串匹配
{
    class Program
    {
        static void Main(string[] args)
        {   
            

          public  int index()

          {
              
              string[] A = new[] {"ababcabcacbab" };
            string[] B = new[] { "abcac" };
                int i=0, j=0;
              
              foreach(string str in A)
              {Console.WriteLine(A[str]);}

              foreach (string str in B)
              {Console.WriteLine(B[str]);}
              
              while (i < A.Length && j < B.Length)
            {
                if (A[i] == B[j]) { i++; j++; }

                else { i = i - j + 2; j = 0; }
            }

            if (j >= B.Length)
                return i - B.Length;
            else return 0;
                Console.Read();

          }
   
        }
    }
}
  i=5! 高手改正一下

一个正确的程序应该是：

public static int index()
{
    string[] A = new[] { "ababcabcacbab" };
    string[] B = new[] { "abcac" };
    int i = 0, j = 0;

    foreach (string str in A)
    { Console.WriteLine(str); }

    foreach (string str in B)
    { Console.WriteLine(str); }

    while (i < A[0].Length && j < B[0].Length)
    {
        if (A[0][i] == B[0][j]) { i++; j++; }

        else { i = i - j + 1; j = 0; }
    }

    if (j >= B[0].Length)
        return i - B[0].Length;
    else return 0;
}

但是不太明。