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提升小数数字精度

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GoEdgeLab
2022-10-23 11:54:00 +08:00
parent 680de5ebd2
commit 08a1263815
2 changed files with 22 additions and 15 deletions
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11
internal/utils/numberutils/utils.go
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@@ -4,6 +4,7 @@ import (
"fmt" "fmt"
"github.com/iwind/TeaGo/types" "github.com/iwind/TeaGo/types"
"strconv" "strconv"
"strings"
) )
func FormatInt64(value int64) string { func FormatInt64(value int64) string {
@@ -44,10 +45,16 @@ func Min[T int | int8 | int16 | int32 | int64 | uint | uint8 | uint16 | uint32 |
return min return min
} }
func FloorFloat32(f float32, decimal int) float32 { func FloorFloat64(f float64, decimal int) float64 {
if decimal <= 0 { if decimal <= 0 {
return f return f
} }
return types.Float32(fmt.Sprintf("%.2f", f)) var s = fmt.Sprintf("%f", f)
var index = strings.Index(s, ".")
if index < 0 || len(s[index:]) <= decimal+1 {
return f
}
return types.Float64(s[:index+decimal+1])
} }

26
internal/utils/numberutils/utils_test.go
View File

@@ -24,20 +24,20 @@ func TestMaxFloat32(t *testing.T) {
t.Logf("%f", math.MaxFloat32/(1<<100)) t.Logf("%f", math.MaxFloat32/(1<<100))
} }
func TestFloorFloat32(t *testing.T) { func TestFloorFloat64(t *testing.T) {
t.Logf("%f", numberutils.FloorFloat32(123.456, -1)) t.Logf("%f", numberutils.FloorFloat64(123.456, -1))
t.Logf("%f", numberutils.FloorFloat32(123.456, 0)) t.Logf("%f", numberutils.FloorFloat64(123.456, 0))
t.Logf("%f", numberutils.FloorFloat32(123, 2)) t.Logf("%f", numberutils.FloorFloat64(123, 2))
t.Logf("%f, %f", numberutils.FloorFloat32(123.456, 1), 123.456*10) t.Logf("%f, %f", numberutils.FloorFloat64(123.456, 1), 123.456*10)
t.Logf("%f, %f", numberutils.FloorFloat32(123.456, 2), 123.456*10*10) t.Logf("%f, %f", numberutils.FloorFloat64(123.456, 2), 123.456*10*10)
t.Logf("%f, %f", numberutils.FloorFloat32(123.456, 3), 123.456*10*10*10) t.Logf("%f, %f", numberutils.FloorFloat64(123.456, 3), 123.456*10*10*10)
t.Logf("%f, %f", numberutils.FloorFloat32(123.456, 4), 123.456*10*10*10*10) t.Logf("%f, %f", numberutils.FloorFloat64(123.456, 4), 123.456*10*10*10*10)
t.Logf("%f, %f", numberutils.FloorFloat32(123.456789, 4), 123.456789*10*10*10*10) t.Logf("%f, %f", numberutils.FloorFloat64(123.456789, 4), 123.456789*10*10*10*10)
t.Logf("%f", numberutils.FloorFloat32(-123.45678, 2)) t.Logf("%f", numberutils.FloorFloat64(-123.45678, 2))
} }
func TestFloorFloat32_Special(t *testing.T) { func TestFloorFloat64_Special(t *testing.T) {
for _, f := range []float32{17.88, 1.11, 1.23456} { for _, f := range []float64{17.88, 1.11, 1.23456} {
t.Logf("%f", numberutils.FloorFloat32(f, 2)) t.Logf("%f", numberutils.FloorFloat64(f, 2))
} }
} }