initial work on fixed

isotest/bits/fixed/fixed.v

@@ -0,0 +1,27 @@
+// Fixed-point decimal numbers
+// based on https://github.com/robaho/fixed/blob/master/fixed.go
+module fixed
+
+import math
+
+const (
+	n_places = 7
+)
+
+pub struct Fixed {
+	fp i64
+}
+
+pub fn new_i(i i64, n u32) Fixed {
+	mut ii := i
+	mut nn := n
+
+	if nn > n_places {
+		ii = ii / i64(math.pow(10, int(nn-n_places)))
+		nn = n_places
+	}
+
+	ii = ii * i64(math.pow(10, int(n_places-nn)))
+
+	return Fixed{fp: ii} 
+}