trouble iterating through multidimensional array

Question

The question is to write a function that returns a bounding rectangle for a set of points in a two dimensional plane. SIZE is two. I know the points will come in this format {double, double} and I know how to create the bounding rectangle. I can't seem to grab the points though. I tried iterating like this.

Rectangle2D getRectangle(const double points[][SIZE], int s) {
for (int i = 0; i < s; i++) {
    for (int j = 0; j < SIZE; j++) {
        cout << points[s][SIZE] << endl;
    }
}
// will put these points in after i figure out the iteration.
Rectangle2D rekt(x, y, width, height);
return rekt;
}

what is x,y,width and height? Anyways in cout << points[s][SIZE] << endl; should be cout << points[i][j] << endl; (observe i & j), if you want to print matrix. — Abhishek
– Abhishek, Commented May 8, 2015 at 4:57
those are variables that im going to assign from the values the array should return. I should have left them out for clarity. I just need to figure out how to iterate correctly. — aeipownu
– aeipownu, Commented May 8, 2015 at 4:58

Leo Lindhorst · Accepted Answer · 2015-05-08 04:58:05Z

1

You are accessing the same element element every time, because s and SIZE remain constant. You have to access it like this points[i][j] . And I'm not sure, but i think you can't pass SIZE within the array argument, you should pass it as an additional parameter. Good luck ;)

answered May 8, 2015 at 4:58

Leo Lindhorst

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Leo Lindhorst Over a year ago

@McNabb ok, there I was not really sure ;)

Abhishek · Accepted Answer · 2015-05-08 04:59:21Z

1

Here you go.

for (int i = 0; i < s; i++) {
    for (int j = 0; j < SIZE; j++) {
        cout << points[i][j] << endl; //observe i,j
    }
}

In above case you are iterating row-wise. If you want to iterate column-wise then following will work.

for (int j = 0; j < SIZE; j++) {
   for (int i = 0; i < s; i++) {
            cout << points[i][j] << endl; //observe i,j
        }
    }

answered May 8, 2015 at 4:59

Abhishek

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