From aff81b33cd5371070e3910c19f85914a305b1d99 Mon Sep 17 00:00:00 2001
From: charlie <3140647@qq.com>
Date: Sun, 27 Mar 2022 10:19:33 +0800
Subject: [PATCH] =?UTF-8?q?=E9=87=91=E9=A2=9D=E8=BD=AC=E6=8D=A2?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 currency/amountConvert.go      | 29 +++++++++++++++++++++
 currency/amountConvert_test.go | 47 ++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+)
 create mode 100644 currency/amountConvert.go
 create mode 100644 currency/amountConvert_test.go

diff --git a/currency/amountConvert.go b/currency/amountConvert.go
new file mode 100644
index 0000000..dcd9c9e
--- /dev/null
+++ b/currency/amountConvert.go
@@ -0,0 +1,29 @@
+package currency
+
+import (
+	"strconv"
+
+	"github.com/shopspring/decimal"
+)
+
+// @title 分转换为元
+// @param cent 金额分
+// @return 字符串表示的元
+func CentToDollar(cent int32) string {
+	d := decimal.New(1, 2)
+
+	result := decimal.NewFromInt32(cent).DivRound(d, 2).StringFixedBank(2)
+
+	return result
+}
+
+// 元转换为分
+func DollarToCent(dollar string) int64 {
+
+	p, _ := strconv.ParseFloat(dollar, 64)
+	d := decimal.New(1, 2)
+
+	df := decimal.NewFromFloat(p).Mul(d).IntPart()
+
+	return df
+}
diff --git a/currency/amountConvert_test.go b/currency/amountConvert_test.go
new file mode 100644
index 0000000..9f7e60c
--- /dev/null
+++ b/currency/amountConvert_test.go
@@ -0,0 +1,47 @@
+package currency
+
+import (
+	"testing"
+)
+
+func TestCentToDollar(t *testing.T) {
+	cases := []struct {
+		cent     int32
+		excepted string
+	}{
+		{24040, "240.40"},
+		{99999940, "999999.40"},
+		{99999, "999.99"},
+		{1, "0.01"},
+		{99999901, "999999.01"},
+		{100000099, "1000000.99"},
+	}
+
+	for _, c := range cases {
+		result := CentToDollar(c.cent)
+		if result != c.excepted {
+			t.Fatalf("dollar to cent failed, dollar:%d execpted:%s result:%s", c.cent, c.excepted, result)
+		}
+	}
+}
+
+func TestDollarToCent(t *testing.T) {
+	cases := []struct {
+		dollar   string
+		excepted int64
+	}{
+		{"240.40", 24040},
+		{"999999.40", 99999940},
+		{"999.99", 99999},
+		{"0.01", 1},
+		{"999999.01", 99999901},
+		{"1000000.99", 100000099},
+	}
+
+	for _, c := range cases {
+		result := DollarToCent(c.dollar)
+		if result != c.excepted {
+			t.Fatalf("dollar to cent failed, dollar:%s execpted:%d result:%d", c.dollar, c.excepted, result)
+		}
+	}
+}