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zhengqiuyun
rym-util
Commits
0eaf471d
Commit
0eaf471d
authored
Nov 11, 2022
by
zhengqiuyun86
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float精度计算
parent
ffa56339
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NumberUtil.go
util/NumberUtil.go
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util/NumberUtil.go
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ffa56339
package
util
import
(
"fmt"
"math/big"
"strconv"
)
type
numberUtilStruct
struct
{
}
var
NumberUtil
=
&
numberUtilStruct
{}
func
(
s
*
numberUtilStruct
)
Float64Format
(
p
float64
,
digit
int
)
float64
{
format
:=
"%."
+
strconv
.
Itoa
(
digit
)
+
"f"
value
,
_
:=
strconv
.
ParseFloat
(
fmt
.
Sprintf
(
format
,
p
),
64
)
return
value
}
type
bigDecimalStruct
struct
{
}
var
BigDecimal
=
&
bigDecimalStruct
{}
// Add 精度加法 a+b
func
(
s
*
bigDecimalStruct
)
Add
(
a
*
float64
,
b
*
float64
)
*
float64
{
r
,
_
:=
new
(
big
.
Float
)
.
Add
(
new
(
big
.
Float
)
.
SetFloat64
(
*
a
),
new
(
big
.
Float
)
.
SetFloat64
(
*
b
))
.
Float64
()
return
&
r
}
// Sub 精度减法 a-b
func
(
s
*
bigDecimalStruct
)
Sub
(
a
*
float64
,
b
*
float64
)
*
float64
{
r
,
_
:=
new
(
big
.
Float
)
.
Sub
(
new
(
big
.
Float
)
.
SetFloat64
(
*
a
),
new
(
big
.
Float
)
.
SetFloat64
(
*
b
))
.
Float64
()
return
&
r
}
// Mul 精度乘法 axb
func
(
s
*
bigDecimalStruct
)
Mul
(
a
*
float64
,
b
*
float64
)
*
float64
{
r
,
_
:=
new
(
big
.
Float
)
.
Mul
(
new
(
big
.
Float
)
.
SetFloat64
(
*
a
),
new
(
big
.
Float
)
.
SetFloat64
(
*
b
))
.
Float64
()
return
&
r
}
// Quo 精度除法 a/b
func
(
s
*
bigDecimalStruct
)
Quo
(
a
*
float64
,
b
*
float64
)
*
float64
{
r
,
_
:=
new
(
big
.
Float
)
.
Quo
(
new
(
big
.
Float
)
.
SetFloat64
(
*
a
),
new
(
big
.
Float
)
.
SetFloat64
(
*
b
))
.
Float64
()
return
&
r
}
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