We have seen that an array is a data structure consisting of a list data items of the same data type.

Each of the data items is identified by the name of the array and a subscript.

Example : Sales() - the sales figures for Tom, a computer salesman for each month of the year...

the actual array is in the green cells.

A two dimensional array needs two subscripts to identify each element.

Example : Sales() - the sales figures for a number of different salesmen (Tom, Dick, Harry, ...) for each month of the year.

You can think of a 2-dimensional array as a spreadsheet with rows and columns...

...the row subscript always comes before the column subscript.

Arrays with dimensions more than two are common in computer programming.

Generally, an n-dimensional array needs n subscripts to identify each element of the array.

Example : Sales() - the sales figures for a number of different salesmen (Tom, Dick, Harry, ...) for each month of the year, for a number of years.

...

Sales(0,0,0) = £2300
Sales(3,2,2) = £1160