basic for loop + examples -> era3

examples/pøck.ang

@@ -1,16 +1,15 @@
 import "math.ang"
 
-func r_x(t) {
-    return 8*(exp(-t) - t)
+fn r_x(t: float) -> float {
+    return 8.0*(exp(-t) - t)
 }
 
-func r_y(t) {
-    return 5*(exp(-t) - t)
+fn r_y(t: float) -> float {
+    return 5.0*(exp(-t) - t)
 }
 
-func r(t) {
-    return format("(%s, %s)", [r_x(t), r_y(t)])
+fn r(t: float) -> (float, float) {
+    return (r_x(t), r_y(t))
 }
 
-write(r(1))
-write()
+println(r(1.0))