Cambridge O Level Computer Science · Syllabus 2210 · Programming
Two-Dimensional Array
What is Two-Dimensional Array?
An array declared with two pairs of bounds and pictured as a grid of rows and columns; each element is selected with one index for each dimension and the whole structure is traversed with nested iteration.
This definition is part of the Programming chapter in Cambridge O Level Computer Science.
Two-Dimensional Array in context
A two-dimensional array is declared with two pairs of bounds: DECLARE <identifier> : ARRAY[<l1>:<u1>, <l2>:<u2>] OF <data type>. It is usually pictured as a grid of rows and columns. A single element is selected with one index value for each dimension, written in the declared order: NoughtsAndCrosses[2,3]. Visiting every element needs nested iteration — one loop for the first dimension and one for the second — and which loop is on the outside decides whether you travel row by row or column by column.