复利计算完成时间统计

package bin;

import java.util.Scanner;

public class compounding {

public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner s=new Scanner(System.in);
System.out.println("1.复利计算 2.单利计算 3.总额反向计算本金 4.买股票算年份 5.本金终值求利率 6.每年都投入本金");
int num=s.nextInt();

switch(num){
case 1:
one(s);
break;
case 2:
two(s);
break;
case 3:
three(s);
break;
case 4:
four(s);
break;
case 5:
five(s);
break;
case 6:
System.out.println("请选择 1.按年定投 2.按月定投:");
int six=s.nextInt();
if(six==1)
six1(s);
else
six2(s);
break;
default:
System.out.println("输入有误");
break;
}

}

private static void five(Scanner s) {
double sum=0;
System.out.println("请输入本金：");
double startmoney=s.nextDouble();
System.out.println("请输入终值:");
double endmoney=s.nextDouble();
System.out.println("请输入年数:");
double years=s.nextInt();
double r=Math.pow((endmoney/startmoney), 1/years)-1;
System.out.println(r);
}

private static void four(Scanner s) {
double sum=0;
System.out.println("请输入本金：");
double startmoney=s.nextDouble();
System.out.println("请输入终值:");
double endmoney=s.nextDouble();
System.out.println("请输入利率:");
double r=s.nextDouble();
double years=Math.log(endmoney/startmoney)/Math.log(1+r);
System.out.println("存入"+startmoney+"每年按"+r+"利率最终获得"+endmoney+"需要"+years);
}

private static void three(Scanner s) {
double sum=0;
System.out.println("请输入终值：");
double money=s.nextDouble();
System.out.println("请输入年数:");
int years=s.nextInt();
System.out.println("请输入利率:");
double r=s.nextDouble();
double Single=money/(1+years*r);
double Double=money/(Math.pow((1+r),years));
System.out.println("单利现值为:"+Single);
System.out.println("复利现值为:"+Double);
}

private static void two(Scanner s) {
double sum=0;
System.out.println("请输入本金：");
double money=s.nextDouble();
System.out.println("请输入年数:");
int years=s.nextInt();
System.out.println("请输入利率:");
double r=s.nextDouble();
sum=money*r*years;
System.out.println("单利计算"+years+"年后总额为:"+sum);
}

private static void one(Scanner s) {
double sum=0;
System.out.println("请输入本金：");
double money=s.nextDouble();
System.out.println("请输入年数:");
int years=s.nextInt();
System.out.println("请输入利率:");
double r=s.nextDouble();
for(int i=1;i<=years;i++){
sum=(1+r)*i*money;
System.out.println(i+"年后总额为"+sum);
}
}

private static void six1(Scanner s){
double sum=0;
System.out.println("请输入每年投入本金：");
double money=s.nextDouble();
System.out.println("请输入年数:");
int years=s.nextInt();
System.out.println("请输入利率:");
double r=s.nextDouble();
sum=money*(1+r)*(-1+Math.pow(1+r, years))/r;

System.out.println("年后总额为"+sum);
}
private static void six2(Scanner s){
double sum=0;
System.out.println("请输入每月投入本金：");
double money=s.nextDouble();
System.out.println("请输入年数:");
int years=s.nextInt();
System.out.println("请输入利率:");
double r=s.nextDouble();
sum=money*12*(1+r)*(-1+Math.pow(1+r, years))/r;
System.out.println("年后总额为"+sum);
}
}

 

 

所用语言:java  所用工具：eclipse

根据前两次要求 估计了4.5.6功能所需要的代码量为：新增50行，所需要的时间为1小时

完成后 4.5.6功能实际代码增加量为：100+行，所需时间为两小时