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78 lines
1.8 KiB
78 lines
1.8 KiB
2 years ago
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package xmath
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import (
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"fmt"
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//"github.com/shopspring/decimal"
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"math"
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"math/rand"
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"strconv"
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"strings"
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)
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// 小数点后 n 位 - 四舍五入
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func RoundedFixed(val float64, n int) float64 {
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shift := math.Pow(10, float64(n))
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fv := 0.0000000001 + val //对浮点数产生.xxx999999999 计算不准进行处理
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return math.Floor(fv*shift+.5) / shift
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}
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// 小数点后 n 位 - 舍去
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func TruncRound(val float64, n int) float64 {
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floatStr := fmt.Sprintf("%."+strconv.Itoa(n+1)+"f", val)
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temp := strings.Split(floatStr, ".")
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var newFloat string
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if len(temp) < 2 || n >= len(temp[1]) {
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newFloat = floatStr
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} else {
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newFloat = temp[0] + "." + temp[1][:n]
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}
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inst, _ := strconv.ParseFloat(newFloat, 64)
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return inst
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}
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// RandInt64 随机范围取值
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func RandInt64(min, max int64) int64 {
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if min >= max || min == 0 || max == 0 {
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return max
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}
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return rand.Int63n(max-min) + min
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}
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func FloatWithoutRightDot(n float64) string {
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s := fmt.Sprintf("%.2f", n)
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ss := strings.Split(s, ".")
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ss1 := strings.TrimRight(ss[1], "0")
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if ss1 == "" {
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return ss[0]
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} else {
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return fmt.Sprintf("%s.%s", ss[0], ss1)
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}
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}
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func NumberFormat(str string) string {
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length := len(str)
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if length < 4 {
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return str
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}
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arr := strings.Split(str, ".") //用小数点符号分割字符串,为数组接收
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length1 := len(arr[0])
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if length1 < 4 {
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return str
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}
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count := (length1 - 1) / 3
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for i := 0; i < count; i++ {
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arr[0] = arr[0][:length1-(i+1)*3] + "," + arr[0][length1-(i+1)*3:]
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}
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return strings.Join(arr, ".") //将一系列字符串连接为一个字符串，之间用sep来分隔。
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}
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func ConvertInt64(s string) int64 {
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v, _ := strconv.ParseInt(s, 10, 64)
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return v
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}
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//
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//func Round(f float64, n int32) float64 {
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// v, _ := decimal.NewFromFloat(f).Round(n).Float64()
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// return v
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//}
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