定期存款利息計算器

後期加工，成為一個實用的功能，這裡作為一個demo,進行記錄。

#include  
using namespace std;
int main()
{
	int  type;
	double money, period, rate, interest;
	cout << "歡迎使用利息計算器！" << endl;
	cout << "請輸入存款金額：";
	cin >> money;
	cout << "======存款期限======" << endl;
	cout << "1. 3個月 " << endl;
	cout << "2. 6個月" << endl;
	cout << "3. 一年 " << endl;
	cout << "4. 二年" << endl;
	cout << "5. 三年" << endl;
	cout << "6. 五年" << endl;
	cout << "請輸入存款期限的代號：";
	cin >> type;
	if (type >= 1 && type <= 6)
	{
		switch (type)   //在if中嵌入了switch分情況處理  
		{
		case 1:
			period = 0.25;
			rate = 0.031;
			break;
		case 2:
			period = 0.5;
			rate = 0.033;
			break;
		case 3:
			period = 1;
			rate = 0.035;
			break;
		case 4:
			period = 2;
			rate = 0.044;
			break;
		case 5:
			period = 3;
			rate = 0.05;
			break;
		case 6:
			period = 5;
			rate = 0.055;
			break;
		}
		interest = money * period * rate;
		cout << "到期利息為：" << interest << "元，本息合計共" << interest + money << "元。" << endl;
	}
	else
		cout << "選擇存款類型錯誤！" << endl;
	cout << "感謝您的使用，歡迎下次光臨！" << endl;
	system("pause");
	return 0;
}