3.5. Arrays of Arrays.   

In many languages it is possible to have arrays of arrays of arrays etc and to deal with each variable type as

(1) elements of the array

(2) the array as a whole

(3) the array of arrays as a whole

(4) etc

The following example illustrates this:

 algorithm types


 const    linelength=132

         pagelength=60


 type     string=array [1..linelength] of char

         page=   array [1..pagelength] of string

         int=    -Integer.MAX_VALUE .. Integer.MAX_VALUE

         letter= 'A'..'Z'

         digit=  '0'..'9'

 var

         form,form2:     page

         line1,line2:    string

         count:          array [letter] of integer

         ch:             char

         i,j:            integer


 begin


         form  form2                        // Copy entire array as a whole


         for i  1 to pagelength do

                 form[i]  form2[i]          // Copy each line of array as a whole


         for i  1 to pagelength do

            for j  1 to linelength do

                 form[i][j]  form2[i][j]    // Copy each character in each line of array


         input(ch)

         if ch in ['0'..'9'] then output('OK')

         else output('nogo')

 end.