c#入门之实现简易存款利息计算器示例

Console.WriteLine("操作指令说明：输入本金(1)，输入存款年度(2)，计算(3)，查看利率(4)，退出(0)");
double benJ=0,liV=0,shouY=0;
int cunY = 0,cmdOrder = 0;
do
{
    cmdOrder=Convert.ToInt16(Console.ReadLine());
    switch (cmdOrder)
    {
        case 1:
            {
                Console.WriteLine("请输入您的本金数额：");
                do
                {
                    benJ = Convert.ToDouble(Console.ReadLine());
                    if (benJ < 100)
                        Console.WriteLine("最低投资额为100，请重新输入：");
                } while (benJ < 100);
                shouY = benJ;
            }
            break;
        case 2:
            {
                Console.WriteLine("请输入存入的年限（1、2、3、5）：");
                do
                {
                    cunY = Convert.ToInt16(Console.ReadLine());
                    if (cunY < 1)
                        Console.WriteLine("存入年限最少为1年，请重新输入：");
                } while (cunY < 1);
            }
            switch (cunY)
            {
                default:
                case 1:
                    liV = 3.00;
                    break;
                case 2:
                    liV = 3.75;
                    break;
                case 3:
                    liV = 4.25;
                    break;
                case 5:
                    liV = 4.75;
                    break;
            }
            liV = liV / 100.00;
            break;
        case 3:
            {
                for (int i = 1; i <= cunY; i++)
                {
                    shouY += benJ * liV;
                    //Console.WriteLine("{0},{1}",shouY,liV);
                }
                Console.WriteLine("按{0}年的利率{1}计算，您的本金{2}将在{0}后增长至：{3}", cunY, liV, benJ, shouY);
                Console.WriteLine("注：未启用自动转存。");
            }
            break;
        case 4:
            {
                Console.WriteLine("利率表，@sfrost");
                Console.WriteLine("1年：3.00%、2年：3.75%");
                Console.WriteLine("3年：4.25%、5年：4.75%");
                Console.WriteLine("\n");
            }
            break;
        default:
            if (cmdOrder != 0) Console.WriteLine("请输入有效的命令序号（1 - 9）：");
            break;
    }
    if (cmdOrder != 0) Console.WriteLine("请输入操作指令（1 - 9）：");
} while (cmdOrder != 0);
Console.WriteLine("\n");
Console.WriteLine("感谢使用^_^，按任意键退出……");
Console.ReadKey();