From 273fa8606b662dbec5b3b0b2fd0d3dfd648e00ab Mon Sep 17 00:00:00 2001 From: Geoffrey Liu Date: Sun, 26 Jun 2016 21:21:13 +0800 Subject: [racket/en] Add more details about Racket (#2278) * Add let* and letrec reference * More elaboration on structs * Add code about predefined car, cdr functions * Mention explicit typing, int to real conversion --- standard-ml.html.markdown | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'standard-ml.html.markdown') diff --git a/standard-ml.html.markdown b/standard-ml.html.markdown index 143980e7..133e4f54 100644 --- a/standard-ml.html.markdown +++ b/standard-ml.html.markdown @@ -24,6 +24,12 @@ val phone_no = 5551337 val pi = 3.14159 val negative_number = ~15 (* Yeah, unary minus uses the 'tilde' symbol *) +(* Optionally, you can explicitly declare types. This is not necessary as + ML will automatically figure out the types of your values. *) +val diameter = 7926 : int +val e = 2.718 : real +val name = "Bobby" : string + (* And just as importantly, functions: *) fun is_large(x : int) = if x > 37 then true else false @@ -31,6 +37,8 @@ fun is_large(x : int) = if x > 37 then true else false val tau = 2.0 * pi (* You can multiply two reals *) val twice_rent = 2 * rent (* You can multiply two ints *) (* val meh = 1.25 * 10 *) (* But you can't multiply an int and a real *) +val yeh = 1.25 * (Real.fromInt 10) (* ...unless you explicitly convert + one or the other *) (* +, - and * are overloaded so they work for both int and real. *) (* The same cannot be said for division which has separate operators: *) -- cgit v1.2.3