Filter array

Question :

An array is defined to be a Filter array if it meets the following conditions

   a. If it contains 9 then it also contains 11.

   b. If it contains 7 then it does not contain 13.

So {1, 2, 3, 9, 6, 11} and {3, 4, 6, 7, 14, 16}, {1, 2, 3, 4, 10, 11, 13} and {3, 6, 5, 5, 13, 6, 13} are Filter arrays. The following arrays are not Filter arrays: {9, 6, 18} (contains 9 but no 11), {4, 7, 13} (contains both 7 and 13)

Write a function named isFilter that returns 1 if its array argument is a Filter array, otherwise it returns 0.

If you are programming in Java or C#, the function signature is

   int isFilter(int[ ] a)

If you are programming in C or C++, the function signature is

   int isFilter(int a[ ], int len) where len is the number of elements in the array.

public static int isFilter(int [] a)

        {

            int result = 1;

            for(int i=0;i<a.Length;i++)

            {

                if(a[i]==9)

                {

                    for(int j=0;j<a.Length;j++)

                    {

                        if(a[j]==11)

                        {

                            result = 1;

                            break;

                        }

                        else

                        {

                            result = 0;

                        }

                    }

                }

                if(a[i]==7)

                {

                    for(int j=0;j<a.Length;j++)

                    {

                        if(a[j]==13)

                        {

                            result = 0;

                            break;

                        }

                    }

                }

            }

            return result;

        }