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String Functions, shift and substring

This example demonstrates the string functions shift and substring.

Other versions: 7.31 | 7.40 | 7.54

Source Code

    DATA output TYPE TABLE OF string.
    output = VALUE #(
      ( `            oo            ` ) ).
    output = VALUE #(
      LET n = strlen( output[ 1 ] ) IN
      BASE output
      FOR j = 2 UNTIL j > n / 2
      LET r = output[ j - 1 ] l = strlen( r ) / 2 IN
        ( shift_left(  val = substring( val = r
                                       len = l )
                                       circular = 1 ) &&
          shift_right( val = substring( val = r
                                       off = l )
                                       circular = 1 ) ) ).
    output = VALUE #(
      LET n = strlen( output[ 1 ] ) IN
      BASE output
      FOR j = n / 2 + 1 UNTIL j > n - 1
      LET r = output[ j - 1 ] l = strlen( r ) / 2 IN
        ( shift_right( val = substring( val = r
                                       len = l )
                                       circular = 1 ) &&
          shift_left(  val = substring( val = r
                                       off = l )
                                       circular = 1 ) ) ).
    cl_demo_output=>display( output ).

Description

This program creates a diamond shape in the display.