[Gambas-user] WHILE and AND: please explain me....

[Leonardo Miliani]

I'm working with this little piece of code, it's the Insertion Sort:

PUBLIC SUB InsertionSort(matrix AS String[])
DIM i, j AS Integer
DIM x AS String

  FOR i = 1 TO (matrix.Count - 1)
    x = matrix[i]
    j = i - 1
    WHILE j >= 0 AND matrix[j] > x
      matrix[j + 1] = matrix[j]
      j -= 1
    WEND 
    matrix[j + 1] = x
  NEXT 
END

But I get an "Out of bound" error in the WHILE test, because j begins
-1.

Usually (in other languages this is the behavior) the AND test checks
the first condition, and if it is false then it checks the second one.
OK... but shouldn't Gambas bypass the WHILE statement because j is
negative?

-- 
Leonardo Miliani
www.leonardomiliani.com

Webmaster e co-fondatore di www.gambas-it.org
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