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SBASIC Manual - Page 51

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     SBasic User's Manual     SBasic Version 2.7             Page 51
     Printed:  December 5, 1999

     You can also use the PULL() function to remove items from the data
     stack.  PULL() works exactly the same was as the POP() function; it is
     simply a synonym for POP().

     You can copy a value from within the data stack by using the PICK()
     function.  PICK() locates a specific item within the data, and returns
     that value.


          n = pick(2)

     copies the third item in the data stack into N.  The size of the data
     stack does not change, and the value in the third item does not

     Note that the item on the top of the stack is item 0; the second item
     is item 1.  SBasic does not check to see how many items are actually
     on the data stack.  If you supply an argument to PICK() that is larger
     than the current data stack, SBasic will return a bogus but legal

     You can alter a value within the data stack by using the PLACE
     statement.  PLACE stores a 16-bit value into a specified item in the
     data stack.


          PLACE  2, n

     stores the value in N into the third item in the data stack.  The
     value in N does not change, and the size of the data stack does not

     SBasic does not test the actual size of the data stack before
     executing the PLACE statement.  Using PLACE to modify an item beyond
     the actual data stack will corrupt that location in memory and could
     crash your program.

     You can combine PICK() and PLACE to create 16-bit variables local to a
     section of code, such as a subroutine.  For example:

               place  0, pick(0) + 1    ' increment the item
          loop while pick(0) < 5        ' loop until it hits 5

     This code uses an item, already stored on the data stack by previous
     code, as a local variable.  Changes to this variable occur only in the
     data stack, not in a DECLAREd variable.