6.2.1 Number classes

Builtin Class: <number>

Builtin Class: <complex>

Builtin Class: <real>

Builtin Class: <integer>

These classes consist a class hierarchy of number objects. <complex> inherits <number>, <real> inherits <complex> and <integer> inherits <real>.

Note that these classes does not exactly corresponds to the number hierarchy defined in R5RS. Especially, only exact integers are the instances of the <integer> class. That is,

(integer? 1) => #t (is-a? 1 <integer>) => #t (is-a? 1 <real>) => #t (integer? 1.0) => #t (is-a? 1.0 <integer>) => #f (is-a? 1.0 <real>) => #t (class-of (expt 2 100)) => #<class <integer>> (class-of (sqrt -3)) => #<class <complex>>