wave array

A wave array is defined to an array which does not contain two even numbers or two odd numbers in adjacent locations. So {7, 2, 9, 10, 5}, {4, 11, 12, 1, 6}, {1, 0, 5} and {2} are all wave arrays. But {2, 6, 3, 4} is not a wave array because the even numbers 2 and 6 are adjacent to each other. Also {3, 4, 9, 11, 8} is not a wave array because the odd numbers 9 and 11 are adjacent to each other. You can assume array has at least one element.
         
Write a function named isWave that returns 1 if its array argument is a Wave array, otherwise it returns 0.

If you are programming in Java or C#, the function signature is
   int isWave (int [ ] a)

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

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

Solution:

public int isWaveArray(int [] a)

        {

            int rtnVal = 1;

            for(int i=0;i<a.Length-1;i++)

            {

                if(a[i]%2==0)

                {

                    if(a[i+1]%2==0)

                    {

                        rtnVal = 0;

                        break;

                    }

                }

                else

                {

                    if(a[i+1]%2!=0)

                    {

                        rtnVal = 0;

                        break;

                    }

                }

            }

            return rtnVal;

        }