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rand: refactor rand.v and random_numbers_test.v

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This commit is contained in:
Hungry Blue Dev
2020-05-28 04:46:17 +05:30
committed by GitHub
parent 04ca7efc0c
commit e89ae7e194
2 changed files with 73 additions and 54 deletions
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30
vlib/rand/rand.v
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@ -3,10 +3,6 @@
// that can be found in the LICENSE file.
module rand
const (
max_i32 = 2147483647
)
fn C.rand() int
pub fn seed(s int) {
@ -29,22 +25,30 @@ 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 rand_uniform_f32() * max
}
// rand_f32 return a random f32 in range min and max
pub fn rand_f32_in_range(min, max f32) f32 {
scaled_r := f32(next(max_i32)) / max_i32
return min + scaled_r * (max - min)
return min + rand_uniform_f32() * (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)
// rand_f64 return a random f64 between 0 (inclusive) and max (exclusive)
pub fn rand_f64(max f64) f64 {
return rand_uniform_f64() * max
}
// rand_f64 return a random f64 in range min and max
// rand_f64 return a random f64 in range min (inclusive) and max (exclusive)
pub fn rand_f64_in_range(min, max f64) f64 {
scaled_r := f64(next(max_i32)) / max_i32
return min + scaled_r * (max - min)
return min + rand_uniform_f64() * (max - min)
}
// rand_uniform_f32 returns a uniformly distributed f32 in the range 0 (inclusive) and 1 (exclusive)
pub fn rand_uniform_f32() f32 {
return f32(C.rand()) / f32(C.RAND_MAX)
}
// rand_uniform_f64 returns a uniformly distributed f64 in the range 0 (inclusive) and 1 (exclusive)
pub fn rand_uniform_f64() f64 {
return f64(C.rand()) / f64(C.RAND_MAX)
}