银行利息实现银行根据存入的现金和年限计算利息

public class Test(){
public decimal Calculation(decimal Months,int principal){
double r;
decimal year = Math.Ceiling(Months/12);
switch (year){
case 1:r=0.025;break;
case 2:r=0.03;break;
case 3:r=0.037;break;
case 4:r=0.04;break;
case 5:r=0.05;break;
}
return yearrprincipal;
}
}

public static void Main(string[] args){
Test test = new Test();
Console.Write(test.Calculation(5*12,10000));//5年，一万元；
Console.Readline();
}

差不多就这样吧