From 48cc8dd86b725d987ec52af149f8442bfd7df547 Mon Sep 17 00:00:00 2001
From: div72 <60045611+div72@users.noreply.github.com>
Date: Wed, 27 May 2020 20:13:57 +0300
Subject: [PATCH] rand: cleanup of rand_f32xxx and rand_f64xxx functions

---
 vlib/rand/rand.v | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/vlib/rand/rand.v b/vlib/rand/rand.v
index c6d478766a..9600f6fc57 100644
--- a/vlib/rand/rand.v
+++ b/vlib/rand/rand.v
@@ -1,9 +1,12 @@
 // Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
 // Use of this source code is governed by an MIT license
 // that can be found in the LICENSE file.
-
 module rand
 
+const (
+	max_i32 = 2147483647
+)
+
 fn C.rand() int
 
 pub fn seed(s int) {
@@ -26,22 +29,22 @@ pub fn rand_r(seed &int) int {
 
 // rand_f32 return a random f32 between 0 and max
 pub fn rand_f32(max f32) f32 {
-    return f32( f64(C.rand()) / ( f64(C.RAND_MAX)/f64(max) ) )
+	return f32(f64(C.rand()) / f64(C.RAND_MAX) * f64(max))
 }
 
 // rand_f32 return a random f32 in range min and max
-pub fn rand_f32_in_range(min f32, max f32) f32 {
-    scaled_r := f32(rand.next( 2147483647 )) / 2147483647.0
-    return min + scaled_r * (max - min )
+pub fn rand_f32_in_range(min, max f32) f32 {
+	scaled_r := f32(next(max_i32)) / max_i32
+	return min + scaled_r * (max - min)
 }
 
 // rand_f64 return a random f64 between 0 and max
 pub fn rand_f64(max f32) f32 {
-    return f64(C.rand()) / ( f64(C.RAND_MAX)/f64(max) )
+	return f64(C.rand()) / f64(C.RAND_MAX) * f64(max)
 }
 
 // rand_f64 return a random f64 in range min and max
-pub fn rand_f64_in_range(min f64, max f64) f64 {
-    scaled_r := f64(rand.next( 2147483647 )) / 2147483647.0
-    return min + scaled_r * (max - min )
-}
\ No newline at end of file
+pub fn rand_f64_in_range(min, max f64) f64 {
+	scaled_r := f64(next(max_i32)) / max_i32
+	return min + scaled_r * (max - min)
+}