Changing index positions within an array

Question

I have a question regarding a 1d array and what I am attempting to do with this array is changing the index value of any value within the array for example

int[] num = new[2,4,6,9]

and what I want to do with this array I want position 0 to become position 1 and position 1 to become 0. So the array would look like [4,2,6,9] and that part is easy enough to do but I am struggling with the parts that come after which is I would like for the array to continue down this path so [4,6,2,9]->[4,6,9,2] and I am struggling with that. So far I am using two array to try this but I am having difficulties. Also I am attempting to do this with all spots and not just the first one.

for (int i = 0; i < n; i++) {
    for (int j = 0; j < n; j++) {
        temp[j] = temp2[i];
        if (j != 0) {
            temp[j - 1] = temp2[j];
        }
    }
    revert(); //I use this methods to restore any changes made so I can attempt with the next spot
}

You don't need a second array, just swap the elements. Also what exactly are you struggling with? — UnholySheep, Oct 14 '18 at 21:11
Or maybe this: https://stackoverflow.com/questions/13766209/effective-swapping-of-elements-of-an-array-in-java — UnholySheep, Oct 14 '18 at 21:14

score 0 · Answer 1 · answered Oct 14 '18 at 21:24

0

Keep only 1 for loop and 1 temp variable to swap your tab.

for (int i = 0; i < N; i++) {
  tmp = tab[i];
  tab[i] = tab[i + 1];
  tab[i + 1] = tmp;
}

answered Oct 14 '18 at 21:24

gfkl

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Changing index positions within an array

1 Answers1