(r5rs.info.gz) Sequencing

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 4.2.3 Sequencing
 ----------------
 
  -- library syntax: begin <expression1> <expression2> ...,
      The <expression>s are evaluated sequentially from left to right,
      and the value(s) of the last <expression> is(are) returned.  This
      expression type is used to sequence side effects such as input and
      output.
 
      (define x 0)
 
      (begin (set! x 5)
             (+ x 1))                        ==>  6
 
      (begin (display "4 plus 1 equals ")
             (display (+ 4 1)))              ==>  _unspecified_
                _and prints_  4 plus 1 equals 5
 
 

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