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6.1 Equivalence predicates 6.2 Numbers 6.3 Other data types 6.4 Control features 6.5 Eval 6.6 Input and output
This chapter describes Scheme's built-in procedures. The initial (or "top level") Scheme environment starts out with a number of variables bound to locations containing useful values, most of which are primitive procedures that manipulate data. For example, the variable `abs' is bound to (a location initially containing) a procedure of one argument that computes the absolute value of a number, and the variable `+' is bound to a procedure that computes sums. Built-in procedures that can easily be written in terms of other built-in procedures are identified as "library procedures".
A program may use a top-level definition to bind any variable. It may subsequently alter any such binding by an assignment (see see section 4.1.6 Assignments). These operations do not modify the behavior of Scheme's built-in procedures. Altering any top-level binding that has not been introduced by a definition has an unspecified effect on the behavior of the built-in procedures.
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