From 20c83a9730c998c4622e2877556282b773904936 Mon Sep 17 00:00:00 2001
From: sumorf <529808348@qq.com>
Date: Mon, 8 Oct 2018 14:04:58 +0800
Subject: [PATCH] add math2/math.go

---
 math2/math.go | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 math2/math.go

diff --git a/math2/math.go b/math2/math.go
new file mode 100644
index 0000000..59ff83a
--- /dev/null
+++ b/math2/math.go
@@ -0,0 +1,39 @@
+package math2
+
+import (
+	"math"
+	"strconv"
+)
+
+func ToFloat64(x string) float64 {
+	v, _ := strconv.ParseFloat(x, 64)
+	return v
+}
+
+// Round returns the nearest integer, rounding ties away from zero.
+func Round(x float64) float64 {
+	t := math.Trunc(x)
+	if math.Abs(x-t) >= 0.5 {
+		return t + math.Copysign(1, x)
+	}
+	return t
+}
+
+// RoundToEven returns the nearest integer, rounding ties to an even number.
+func RoundToEven(x float64) float64 {
+	t := math.Trunc(x)
+	odd := math.Remainder(t, 2) != 0
+	if d := math.Abs(x - t); d > 0.5 || (d == 0.5 && odd) {
+		return t + math.Copysign(1, x)
+	}
+	return t
+}
+
+func round(num float64) int {
+	return int(num + math.Copysign(0.5, num))
+}
+
+func ToFixed(num float64, precision int) float64 {
+	output := math.Pow(10, float64(precision))
+	return float64(round(num*output)) / output
+}