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Interpretive features

• One can define a function that builds Scheme code and requests its interpretation

• The interpreter is a user-available function, EVAL

• Suppose we have a list of numbers that must be added together

      (define (adder lis)
          (cond
              ((null? lis) 0)
              (else (eval (cons '+ lis)))
          )
      )
  

• The parameter is a list of numbers to be added; adder inserts a + operator and interprets the resulting list