%lld

%Lf

Syntax for getting value of a defined variable.

In the evaluator, references are held in the reader and in ret. The evaluator can be augmented to create variables by reference.

list evaluates it’s arguments to create a list. It looks just like a procedure. Consider a variant of list which doesn’t evaluate it’s arguments. A list which is like a variadic quote. Write a list procedure like that in terms of cons, car and, cdr.

R7RS 1.1

Scheme’s model of arithmetic is designed to remain as independent as possible of the particular ways in which numbers are represented within a computer. In Scheme, every integer is a rational number, every rational is a real, and every real is a complex number. Thus the distinction between integer and real arithmetic, so important to many programming languages, does not appear in Scheme. In its place is a distinction between exact arithmetic, which corresponds to the mathematical ideal, and inexact arithmetic on approximations. Exact arithmetic is not limited to integers.

Currently L only performs arithmetic operations on integers.