fix bounds + update libs

examples/pi-approx.ang

@@ -7,19 +7,19 @@
 terms := 1000000
 
 # The running sum of terms
-tot := 0
+tot := 0.0
 
 n := 1
 while n <= terms {
-	tot = tot + 1 / (n*n)
+	tot = tot + 1.0/float(n*n)
 	n = n + 1
 }
 
-tot = tot * 6
+tot = tot * 6.0
 
 # get the absolute value of a number
-func abs(x: number) number {
-	if x < 0 {
+fn abs(x: float) -> float {
+	if x < 0.0 {
 		return -x
 	}
 	return x
@@ -30,19 +30,19 @@ func abs(x: number) number {
 # see: https://en.wikipedia.org/wiki/Newton's_method
 # The required accuracy
 SQRT_ACC := 0.00000001
-func sqrt(x: number) number {
-    pg := 0 # previous guess
-    g := 1 # current guess
+fn sqrt(x: float) -> float {
+    pg := 0.0 # previous guess
+    g := 1.0 # current guess
 
     while abs(pg - g) >= SQRT_ACC {
         pg = g
-        g = (pg + tot/pg)/2
+        g = (pg + x/pg)/2.0
     }
 
     return g
 }
 
-tot = sqrt(tot)
+pi := sqrt(tot)
 
 # output the result
-write(str(tot))
+println(pi)