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Create random number and modify them in array

Posted on 2010-11-08
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Last Modified: 2012-05-10
Write a program to do the following.  First, create an array of 10 elements of  int type.  Use a random number generator to generate the 10 elements.  Each element is a random integer that is either 1, 2 or 3.  Once these 10 random elements are generated, display them in the console window.

      Next, examine the elements and modify them if necessary.  Our goal is that no two consecutive elements are the same.  In other words, every element must be different from the element right before it.  For example, if both the 4th and the 5th elements are 2, change the 5th element to something else.  The rules we use to modify the elements are as follows.  If there are two consecutive elements of 1, change the second 1 to 2.  If there are two consecutive elements of 2, change the second 2 to 3.  If there are two consecutive elements of 3, change the second 3 to 1.  After all the necessary changes are made, display all the 10 elements of the modified array.
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Question by:rcham68
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sedgwick earned 500 total points
ID: 34083656
here you go:
 Random rnd = new Random(0);
            int[] arr = new int[10];
            for (int i = 0; i < 10; i++)
            {
                arr[i] = rnd.Next(1, 4);
            }

            foreach (int item in arr)
            {
                Console.WriteLine(item);
            }

            //after rules modification
            for (int i = 0; i < 9; i++)
            {
                if (arr[i] == arr[i + 1])
                {
                    switch (arr[i])
                    {
                        case 1:
                            arr[i + 1] = 2;
                            break;
                        case 2:
                            arr[i + 1] = 3;
                            break;
                        case 3:
                            arr[i + 1] = 1;
                            break;
                    }
                }
            } 
            Console.WriteLine();

            foreach (int item in arr)
            {
                Console.WriteLine(item);
            }

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Author Closing Comment

by:rcham68
ID: 34083930
Thanks for the help Did not remember how to assign a random number to the array
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