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SBASIC Manual - Page 27

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     SBasic User's Manual     SBasic Version 2.7             Page 27
     Printed:  December 5, 1999
     Control structures

     SBasic supports several structures for controlling the flow of your
     program.  Used properly, these control structures can improve the
     quality of your program design, making your source file easier to
     read, understand, and debug.

     Some of the following control structures allow or require a comparison
     clause.  Such clauses consist of an expression, a comparison operator,
     and a second expression.  The comparison clause is evaluated as your
     program runs and, depending on the evaluation, control transfers
     within the control structure.


          while  a < 5
               a = a + 1

     Here, the comparison clause "a < 5" determines whether control remains
     in the WHILE-WEND loop or transfers to the line following the WEND

     All comparison clauses may contain one and only one comparison
     operator.  Multiple comparisons, such as:

          while a < 5 and c-1 = 3

     are illegal and will generate compilation errors.

     Note also that you do not enclose comparisons within parentheses.
     Doing so will result in a compilation error.

     WHILE-WEND is a conditional loop structure.  Control executes all
     statements between the WHILE statement and the WEND statement for so
     long as the comparison in the WHILE clause is TRUE.  When the
     comparison becomes FALSE, control exits the loop by transferring to
     the line following the WEND statement.


          while  a < 500           ' loop while a is less than 500
               a = a + 1           ' increment a
          wend                     ' end of loop

     This example loops for so long as the value in A is less than
     (unsigned) 500.

     Note that WHILE-WEND is obsolete, even though SB still supports it.
     WHILE-WEND has been replaced by the more flexible DO-LOOP structure.
     DO-LOOP is a loop structure that may be either conditional or
     unconditional.  Control executes all statements between the DO