[Dana] Add Dot Product (#56)

* Add Dot Product program

* Fix indentation of dot_product.dana

---------

Co-authored-by: Kostis Sagonas <kostis@cs.ntua.gr>

Author: nicholas-agg

dana/programs/dot_product.dana

@@ -0,0 +1,34 @@
+def main
+begin
+     def dot_product is int : n as int, vector1 as int [], vector2 as int []
+     begin
+        var product i is int
+        product := 0
+        i := 0
+        loop:
+          begin
+            if i == n : begin break end
+            product := product + vector1[i]*vector2[i]
+            i := i + 1
+          end
+        return : product
+     end
+
+  var ex_vector1 ex_vector2 is int[4]
+
+  ex_vector1[0] := 2
+  ex_vector1[1] := 4
+  ex_vector1[2] := 6
+  ex_vector1[3] := 8
+
+  ex_vector2[0] := 1
+  ex_vector2[1] := 3
+  ex_vector2[2] := 5
+  ex_vector2[3] := 7
+
+  var result is int
+  result := dot_product : 4, ex_vector1, ex_vector2
+  writeString : "The dot product of the two vectors is: "
+  writeInteger : result
+  writeChar : '\n'
+end

dana/programs/dot_product.result

@@ -0,0 +1 @@
+The dot product of the two vectors is: 100