calculate A^N

A = 2.5
N = 7
PRINT A^N

POW = 1
i2 = A
WHILE N > 0
  IF (N MOD 2) = 1 THEN
    POW = POW * i2
    N = (N-1) / 2
  ELSE
    N = N / 2
  END IF
  i2 = i2*i2
WEND

PRINT POW