Please i need help on multidimensional arrays in c++, it is a challenge to me,

Question

Like this one
int x[2][3] = {
{2, 3, 4}, // 1st row
{8, 9, 10} // 2nd row
};
Please why do they skip 5,6,7 and land at 8,9,10?
And what do they mean by 2D,3D shapes ?

Answer 1

Hi Agofack,
Ever used a spreadsheet application like MS Excel? we can think of a worksheet when it comes to 2D arrays, worksheets consist of rows and columns. The difference to note here in a language such as C++, arrays must contain data of a certain type, that is, we cannot mix different types of data in an array.

Q: Why they skip some values?
A: We are free to store any data at a certain cell, as long as data type is correct. We can even change the values as we see fit.

Q: What do they mean by 2D, 3D?
A: The 'D' letter following the number describes the number of dimensions the said array is allocated:

● 1D arrays consist of one row with multiple columns.

● 2D arrays consist of multiple rows with multiple columns. A worksheet of rows and columns can be used to picture this.

● 3D arrays consist of rows and columns, where each columns themselves are arrays. A Rubik cube can be used to picture this, it has height (rows), (width) columns, and each column builds the cube's volume.

Hth, cmiiw

Answer 2

Ipang
Oh thanks

Answer 3

you can think of multidimensional arrays as a table with rows and columns.
those numbers (8,9,10)can be anything you want.
the example you provided has 3 rows and 4 columns. so there should be more data in it.
here is a visual table for your array

| x[0] [0] ¦ x[0] [1] ¦ x[0] [2] ¦ x[0] [3] |
_________ _______ __________ ________
| x[1] [0] ¦ x[1] [1] ¦ x[1] [2] ¦ x[1] [3] |
_________ _______ _________ ______
| x[2] [0] ¦ x[2] [1] ¦ x[2] [2] ¦ x[3] [3] |

2D shapes are like a rectangle, a square....
3D shapes are cubes, prism..... things that have a height, width and length.

Answer 4

bahha thanks but this still not clear to me 3rows and 4columns, i taught it is 2rows ,3 column, look at it int x[2][3]=, please how come is it 3rows and 4 columns? thanks

Answer 5

Agofack because in arrays the index start at 0. look at the table.
don't confuse the array index and the value they can hold.
for example you can write:
x[0] [0] = 5;
each place on the table can have its own value.

Answer 6

bahha ohh thanks very much my worries are all gone thanks once more