prefix notation
general form of a scheme expr
- (operator operand operand operand …)
- eg, in (+ 3 4)
+ is the operator
3 is the first operand
4 is the second operand
prefix notation
- operator comes first
- why? uniformity
many operands: (+ 3 4 5)
no funny typography: (square 3), (floor 3.1)