NOTE: == is equality, = is assignment (C-style). Operators:
Operators
Operator Description Lisp Ristretto
\ quoting character: x\-y --> x-y
! lisp escape !(foo bar) --> (foo bar)
; comment
x = y assignment (setf x y)
x += y increment (incf x y)
x -= y decrement (decf x y)
x *= y multiply and store (setf x (* x y))
x /= y divide and store (setf x (/ x y))
x|y bitwise logical inclusive or (logior x y) YES
x^y bitwise logical exclusive or (logxor x y) YES
x&y bitwise logical and (logand x y) YES
x << y left shift (ash x y) YES
x >> y right shift (ash x (- y)) YES
~x ones complement (unary) (lognot x)
x and y conjunction (and x y) YES
x && y conjunction (and x y) YES
x or y disjunction (or x y) YES
x || y disjunction (or x y) YES
not x negation (not x) YES
x^^y exponentiation (expt x y) YES
x,y sequence (progn x y) YES
(x,y) sequence (progn x y) YES

also parenthesis (x+y)/z --> (/ (+ x y) z) YES
f(x,y) functions (f x y) YES*
a[i,j] array reference (aref a i j)
x+y x*y arithmetic (+ x y) (* x y) YES
x-y x/y arithmetic (- x y) (/ x y) YES
-y value negation (- y) YES
x % y remainder (mod x y) YES
x < y x > y inequalities (< x y) (> x y) YES
x <= y x >= y inequalities (<= x y) (>= x y) YES
x == y equality (= x y) YES
x != y equality (not (= x y)) YES
if p then q conditional (when p q) YES
if p then q else r conditional (if p q r) YES

* The functions implemented in Ristretto include...
SIN
COS
TAN
RANDOM.
They have equivilent functionality to the common lisp versions of these functions.