work on fixed

isotest/bits/fixed/fixed.v

@@ -59,6 +59,32 @@ pub fn (f Fixed) sub(b Fixed) Fixed {
 	return Fixed{fp: f.fp - b.fp}
 }
 
+pub fn (f Fixed) mul(b Fixed) Fixed {
+	// XXX
+	f0 := b
+
+	fp_a := f.fp / c_scale
+	fp_b := f.fp % c_scale
+
+	fp0_a := f0.fp / c_scale
+	fp0_b := f0.fp % c_scale
+
+	mut result := i64(0)
+
+	if fp0_a != 0 {
+		result = fp_a*fp0_a*c_scale + fp_b*fp0_a
+	}
+	if fp0_b != 0 {
+		result = result + (fp_a * fp0_b) + ((fp_b)*fp0_b)/c_scale
+	}
+
+	return Fixed{fp: result}
+}
+
+pub fn (f Fixed) div(b Fixed) Fixed {
+	return new_f(f.float() / b.float())
+}
+
 pub fn (f Fixed) float() f64 {
 	return f64(f.fp) / f64(c_scale)
 }

isotest/bits/fixed/fixed_test.v

@@ -37,6 +37,28 @@ fn test_fixed() {
 		println("f4.float: ${f4.float()}")
 		println("f5.float: ${f5.float()}")
 	}
+
+	{
+		println("mul:")
+
+		f1 := new_f(1.1)
+		f2 := new_f(10)
+
+		r := f1.mul(f2)
+
+		println("r.float: ${r.float()}")
+	}
+
+	{
+		println("dev:")
+
+		f1 := new_f(1.1)
+		f2 := new_f(2.0)
+
+		r := f1.div(f2)
+
+		println("r.float: ${r.float()}")
+	}
 	
 	println("done")
 }