work on fixed

isotest/bits/fixed/fixed.v

@@ -6,12 +6,16 @@ import math
 
 const (
 	n_places = 7
+	scale = i64(10 * 10 * 10 * 10 * 10 * 10 * 10)
 )
 
 pub struct Fixed {
 	fp i64
 }
 
+// i: number
+// n: precision/fraction amount
+// n moves the decimal point N places left
 pub fn new_i(i i64, n u32) Fixed {
 	mut ii := i
 	mut nn := n
@@ -24,4 +28,16 @@ pub fn new_i(i i64, n u32) Fixed {
 	ii = ii * i64(math.pow(10, int(n_places-nn)))
 
 	return Fixed{fp: ii} 
-}
+}
+
+pub fn (f Fixed) add(b Fixed) Fixed {
+	return Fixed{fp: f.fp + b.fp} 
+}
+
+pub fn (f Fixed) sub(b Fixed) Fixed {
+	return Fixed{fp: f.fp - b.fp}
+}
+
+pub fn (f Fixed) float() f64 {
+	return f64(f.fp) / f64(scale)
+}

isotest/bits/fixed/fixed_test.v

@@ -0,0 +1,25 @@
+module fixed
+
+fn test_fixed() {
+	f := new_i(1, 1)
+
+	println("f: $f")
+	println("f.float: ${f.float()}")
+
+	{
+		println("add:")
+		
+		a := new_i(11, 1)
+		b := new_i(22, 1)
+
+		r := a.add(b)
+
+		println("a.float: ${a.float()}")
+		println("b.float: ${b.float()}")
+
+		println("r: $r")
+		println("r: ${r.float()}")
+	}
+	
+	println("done")
+}