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work on fixed

This commit is contained in:
coaljoe 2020-10-27 16:36:48 +03:00
parent 58f4d4b4f3
commit 481e204323
2 changed files with 45 additions and 7 deletions
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35
isotest/bits/fixed/fixed.v
View File

@ -5,14 +5,17 @@ module fixed
import math
const (
n_places = 7
scale = i64(10 * 10 * 10 * 10 * 10 * 10 * 10)
c_n_places = 7
c_scale = i64(10 * 10 * 10 * 10 * 10 * 10 * 10)
c_max = f64(99999999999.9999999)
)
pub struct Fixed {
fp i64
}
// New from integer
// i: number
// n: precision/fraction amount
// n moves the decimal point N places left
@ -20,16 +23,34 @@ pub fn new_i(i i64, n u32) Fixed {
mut ii := i
mut nn := n
if nn > n_places {
ii = ii / i64(math.pow(10, int(nn-n_places)))
nn = n_places
if nn > c_n_places {
ii = ii / i64(math.pow(10, int(nn-c_n_places)))
nn = c_n_places
}
ii = ii * i64(math.pow(10, int(n_places-nn)))
ii = ii * i64(math.pow(10, int(c_n_places-nn)))
return Fixed{fp: ii}
}
// New from floating point
pub fn new_f(f f64) Fixed {
if math.is_nan(f) || math.is_inf(f, 0) {
panic("error: cannot convert value to Fixed: f: $f")
}
if f >= c_max || f <= -c_max {
panic("error: cannot convert value to Fixed, it exceeds MAX range: f: $f")
}
mut round := 0.5
if f < 0 {
round = -0.5
}
return Fixed{fp: i64(f*f64(c_scale) + round)}
}
pub fn (f Fixed) add(b Fixed) Fixed {
return Fixed{fp: f.fp + b.fp}
}
@ -39,5 +60,5 @@ pub fn (f Fixed) sub(b Fixed) Fixed {
}
pub fn (f Fixed) float() f64 {
return f64(f.fp) / f64(scale)
return f64(f.fp) / f64(c_scale)
}

17
isotest/bits/fixed/fixed_test.v
View File

@ -20,6 +20,23 @@ fn test_fixed() {
println("r: $r")
println("r: ${r.float()}")
}
{
println("floating point:")
f1 := new_f(1.1)
f2 := new_f(2.2)
f3 := new_f(0.01)
f4 := new_f(-0.01)
f5 := new_f(0.0)
//f6 := new_f(f64('NaN'))
println("f1.float: ${f1.float()}")
println("f2.float: ${f2.float()}")
println("f3.float: ${f3.float()}")
println("f4.float: ${f4.float()}")
println("f5.float: ${f5.float()}")
}
println("done")
}