Conditionals

GreetingByHour1.scm

(define Greeting (lambda (hour24) (if (< hour24 12) "Good Morning" (if (< hour24 18) "Good Afternoon" "Good Evening" ) ) ) )

An if operator is available:
<expression> ---> (if <test> <consequent> <alternate> )
<expression> ---> (if <test> <consequent> )
<test> ---> <expression> <consequent> ---> <expression> <alternate> ---> <expression>

Note that everything what is not equivalent to #f is considered as true in tests including the empty list in R5S5 conforming implementations. This behavior also diverts from many other Lisp dialects.

	An `if` operator is available: <expression> ---> `(if` <test> <consequent> <alternate> `)` <expression> ---> `(if` <test> <consequent> `)` <test> ---> <expression> <consequent> ---> <expression> <alternate> ---> <expression>
	Note that everything what is not equivalent to `#f` is considered as true in tests including the empty list in R5S5 conforming implementations. This behavior also diverts from many other Lisp dialects.