Standard ML of New Jersey, Version 109.27, April 20, 1997
- use "let.sml";
[opening let.sml]
val pi = 3.14159 : real
val yards2feet = fn : real -> real
val square_real = fn : real -> real
val feetsq2acres = fn : real -> real
GC #0.0.0.0.1.16:   (0 ms)
val circle_area1 = fn : real -> real
let.sml:36.4 Error: syntax error: inserting  IN ID END

uncaught exception Compile [Compile: "syntax error"]
  raised at: build/compile.sml:39.20-39.31
             build/evalloop.sml:191.58
             build/evalloop.sml:283.46-283.49
-
- use "let.sml";
[opening let.sml]
val pi = 3.14159 : real
val yards2feet = fn : real -> real
val square_real = fn : real -> real
val feetsq2acres = fn : real -> real
val circle_area1 = fn : real -> real
val circle_area2 = fn : real -> real
GC #0.0.0.0.2.82:   (0 ms)
val rect_area = fn : real * real -> real
val it = () : unit
-
- circle_area1 (30.0);
val it = 0.146044989669 : real
-
- circle_area2 (30.0);
val it = 0.146044989669 : real
-
- circle_area1 (50.0);
val it = 0.40568052686 : real
-
- circle_area1 (100.0);
val it = 1.62272210744 : real
-
- rect_area(50.0,100.0);
val it = 1.03305785124 : real

- (* Below here is another ML session, showing let being used outside of *)
- (* a function *)
-
- let 
=    x=3;
= in
=    4*x   
= end;
stdIn:51.1 Error: syntax error found at ID
-
- let
=    val x=3;
= in
=    3*x 
= end;
val it = 9 : int
-
- x;
stdIn:59.1 Error: unbound variable or constructor: x
- 
- fun sumsquared (x:int, y:int) =
=    let
=       val sum = x+y;
=    in
=       sum*sum
=    end;
val sumsquared = fn : int * int -> int
- 
- sumsquared(2,3);
val it = 25 : int
-