self-test: expressions, values & names

parens mean application

• ((* 4 5))
• (*4 5)

compound expressions

• (+ (if (< 3 2) * 4) 7)
• ((if (< 3 2) + *) 4 5)

special & regular forms

• (if (< 4 5) (+ 1 2) (5 5))
• (define (f a b) a)
• (f (+ 1 2) (5 5))
• (if if)

naming

• (define * 5)
• (+ * 7)
• (define 2 3)

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