task 2 - sum and length

assignment3/main.oz

@@ -24,3 +24,10 @@ in
     {TestQuad 2.0 1.0 ~1.0}
     {TestQuad 2.0 1.0 2.0}
 end
+
+
+% task 2
+fun {Sum List}
+    case List of Head|Tail then Head + {Sum Tail} else 0 end
+end
+

assignment3/report.md

@@ -39,3 +39,14 @@ procedural abstractions (`proc` instead of `fun`) enable side-effects and intera
 c) already covers some of the differences. a `fun`ction will have a set signature and have some different syntactic parsing. in some languages, functions don't allow sequential expressions, but oz is weird, so they are allowed. you may also print values to stdout in a function, unlike languages like haskell. 
 
 the distinction is in a way pedantic, but a useful one to make. one entails mathematical functions and all their bells and whistles, while the other corresponds more closely to how a computer works. this furthers oz as a general purpose multi-paradigm programming language.
+
+## task 2
+
+a simple recursive sum implementation
+
+```oz
+fun {Sum List}
+    case List of Head|Tail then Head + {Sum Tail} else 0 end
+end
+```
+