stu_uuos/util/math.go

package util

import (
	"fmt"
	"strconv"
)

//四舍五入，默认保留2位小数位
func Round(f float64) float64 {
	return RoundDecimal(f, 2)
}

func RoundDecimal(f float64, d int64) float64 {
	res, err := strconv.ParseFloat(fmt.Sprintf("%."+strconv.FormatInt(d, 32)+"f", f), 64)
	if err != nil {
		panic(err)
	}
	return res
}

//0.01412 --> 141.2  --> 141.2000 --> 141
//1.01412 --> 10141.2 --> 10141.2000 --> 10141
//9.99999 --> 99999.9 --> 99999.9000 --> 99999

//0.014199999 --> 141.99999  --> 142.0000 --> 142
//1.014199999 --> 10141.99999 --> 10142.0000 --> 10142
//9.999999999 --> 99999.99999 --> 100000.0000 --> 100000
//9.999999999 --> 9999999.999 --> 10000000.00 --> 10000000
func GetIntPrice(v float64) int64 {
	//6位小数的价格，如：0.034875，四舍五入后向上取整转换为整数保存
	return int64(RoundDecimal(v*1000000, 0)) //价格存储的为4位小数的值
}

//1412 --> 0.1412 --> 0.1412
//101412 --> 10.1412 --> 10.1412
//999999 --> 99.9999 --> 99.9999

//1419999 --> 141.9999 --> 141.9999
//1014199999 --> 101419.9999 --> 101419.9999
//999999999 --> 99999.9999 --> 99999.9999
func GetFloatPrice(v int64) float64 {
	return float64(v) / 1000000.00
}