-- Arithmetic: prefix operators, no parentheses needed for nesting.
-- All numbers are f64; whole numbers print without .0.
-- Add two numbers
add a:n b:n>n;+a b
-- (a * b) + c — inner op becomes an operand, no parens required
mul-add a:n b:n c:n>n;+*a b c
-- Average of three: a + (b + c), divided by 3
avg a:n b:n c:n>n;/+a +b c 3
-- run: add 10 20
-- out: 30
-- run: mul-add 3 4 5
-- out: 17
-- run: avg 10 20 30
-- out: 20