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Flow control: loop (while) 
data: NUM type I,
      STR(1).

while SY-INDEX < 10.
  STR = SY-INDEX.
  NUM = NUM + SY-INDEX.
  if SY-INDEX > 1.
    write '+'.
  endif.
  write STR.
endwhile.

write: '=', NUM.
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 =          45