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Two-dimensional arrays

A two-dimensional array has two subscripts

Example:

The three monthly sales totals for six salesmen are set up in a two-dimensional array called 'SALES'.

  January February March
John Sykes £450 £320 £520
Linda Judge £180 £220 £460
Sam Good £620 £650 £710
Lynn Horton £460 £420 £380
Jim Talbot £120 £210 £190
Lucy King £420 £380 £550

There are 6 rows and 3 columns. (The grey headings are not part of the array - they are headings for us to understand the meaning of the array)

SALES[3,2] would be '£650' (Row 3, Column 2).

NB : In Pascal, a variable declaration would have to be made as follows :

var SALES : Array[1..6,1..3] of integer;

When processing a two-dimensional array, it usually involves a nested loop (a loop inside another loop). The following Pascal procedure would display the elements of the sales figures array..

procedure DisplayArray;
var i, j : integer;
begin
  for i := 1 to 6 do
  begin  
    for j := 1 to 3 do
      write(Sales[i,j] );
    writeln;
  end  
end;