basic for loop + examples -> era3

examples/pi-approx.ang

@@ -20,9 +20,10 @@ tot = tot * 6.0
 # get the absolute value of a number
 fn abs(x: float) -> float {
 	if x < 0.0 {
-		return -x
+		-x
+	} else {
+	    x
 	}
-	return x
 }
 
 # calculate an approximation of the square root of tot using