( Procedure calls

Info Catalog ( Literal expressions ( Primitive expression types ( Procedures
 4.1.3 Procedure calls
  -- syntax: <operator> <operand1> ...,
      A procedure call is written by simply enclosing in parentheses
      expressions for the procedure to be called and the arguments to be
      passed to it.  The operator and operand expressions are evaluated
      (in an unspecified order) and the resulting procedure is passed
      the resulting arguments.  
      (+ 3 4)                                ==>  7
      ((if #f + *) 3 4)                      ==>  12
      A number of procedures are available as the values of variables in
      the initial environment; for example, the addition and
      multiplication procedures in the above examples are the values of
      the variables `+' and `*'.  New procedures are created by
      evaluating lambda expressions (see section  Procedures).
      Procedure calls may return any number of values (see `values' in section
       Control features).  With the exception of `values' the
      procedures available in the initial environment return one value
      or, for procedures such as `apply', pass on the values returned by
      a call to one of their arguments.
      Procedure calls are also called _combinations_.
           _Note:_ In contrast to other dialects of Lisp, the order of
           evaluation is unspecified, and the operator expression and
           the operand expressions are always evaluated with the same
           evaluation rules.
           _Note:_ Although the order of evaluation is otherwise
           unspecified, the effect of any concurrent evaluation of the
           operator and operand expressions is constrained to be
           consistent with some sequential order of evaluation.  The
           order of evaluation may be chosen differently for each
           procedure call.
           _Note:_ In many dialects of Lisp, the empty combination, (),
           is a legitimate expression.  In Scheme, combinations must
           have at least one subexpression, so () is not a syntactically
           valid expression.
Info Catalog ( Literal expressions ( Primitive expression types ( Procedures
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