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rand: cleanup of rand_f32xxx and rand_f64xxx functions

pull/5080/head
div72 2020-05-27 20:13:57 +03:00 committed by GitHub
parent 84edbd83da
commit 48cc8dd86b
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1 changed files with 13 additions and 10 deletions
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17
vlib/rand/rand.v
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@ -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
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
pub fn rand_f64_in_range(min, max f64) f64 {
scaled_r := f64(next(max_i32)) / max_i32
return min + scaled_r * (max - min)
}