Note on negative integer constants

Using a negative integer constant may cause a problem like the following: For example,

for i 5 -1

causes the syntax error, because the second parameter is regarded as "5-1" instead of "5" and the third parameter is empty. To avoid this problem, take one of the following solutions:

1. Put "0" before "-".

   for i 5 0-1

2. Add parenthese.

   for i 5 (-1)

3. Assign the negative constant to a variable.

   
   A = -1
   for i 5 A