first commit

common/tool/coinconvert.go

@@ -0,0 +1,19 @@
+package tool
+
+import "github.com/shopspring/decimal"
+
+var oneHundredDecimal decimal.Decimal = decimal.NewFromInt(100)
+
+//分转元
+func Fen2Yuan(fen int64) float64 {
+	y, _ := decimal.NewFromInt(fen).Div(oneHundredDecimal).Truncate(2).Float64()
+	return y
+}
+
+//元转分
+func Yuan2Fen(yuan float64) int64 {
+
+	f, _ := decimal.NewFromFloat(yuan).Mul(oneHundredDecimal).Truncate(0).Float64()
+	return int64(f)
+
+}