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SBASIC Manual - Page 30

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     SBasic User's Manual     SBasic Version 2.7             Page 30
     Printed:  December 5, 1999
     Note that it is legal (but not good practice) to modify the index
     variable inside the loop.

     Normally, the index variable increments by one each time control
     reaches the bottom of the loop.  You can change the value by which the
     index variable increments with the STEP modifier.

     Example:

          for n = 1 to 10 step 2
               a = a + n
          next

     Here, the variable N starts with a value of one, and increments by two
     each time control reaches the NEXT statement.  Thus, N takes on the
     values 1, 3, 5, 7, 9, and 11.  When N becomes 11 at the top of the
     loop, control immediately passes to the statement following the NEXT
     statement.



     The SELECT statment marks the beginning of a SELECT-CASE control
     structure.  The SELECT-CASE structure allows your code to select one
     option out of a list, based on the value of an argument, called the
     selector.  Only the CASE clause associated with the matching selector
     value, if any, is executed.

     The general format of a SELECT-CASE structure is:

          select  foo                   ' use value of FOO as selector
               case  123                ' if FOO = 123...
               .                        ' execute this code
               .                        '
               endcase                  ' end of case 1

               case  456                ' if FOO = 456...
               .                        ' execute this code
               .                        '
               endcase                  ' end of case 2
          endselect                     ' end of select structure

     This structure replaces the older ON-GOTO construct, and allows
     creation of code that is easier to debug and maintain.

     The SELECT-CASE structure supports variations for handling special
     cases.  For example:

          select  foo + 3*j             ' use expression for selector
               case  1                  ' if selector = 1...
               case  n                  ' or N...
               case  'X'                ' or ASCII character X...
               foo = n + 3              ' change FOO
               endcase                  ' end of first case