Compound Interest Calculator3.0续
2016-03-21 22:30
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1.你写的程序能让客户随意操作吗?误输入数据、不小心做了非常规的操作程序是什么反应?
2.如果向银行贷款10万元,年利率6.5%,期限为10年,那么每月等额本息还款多少?(算复利条件下等额还款金额)
2.如果向银行贷款10万元,年利率6.5%,期限为10年,那么每月等额本息还款多少?(算复利条件下等额还款金额)
import java.util.Scanner; public class Calculator4 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner scanner = new Scanner(System.in); int key=0; while (key == 0 || key == 1 || key == 2 || key==3 || key==4 || key==5) { System.out.println("欢迎使用" + "\n计算单利和复利终值,请按1" + "\n计算本金,请按2" + "\n股票投资,请按3" + "\n计算利率,请按4" + "\n计算资产总值,请按5" + "\n计算月等额还款金额,请按6" + "\n请输入:"); int key1 = scanner.nextInt(); if (key1 == 1) { Calculator4.DanliandFuli(); // 计算单利和复利 break; } else if (key1 == 2) { Calculator4.Principal(); // 计算本金 break; } else if (key1 == 3) { Calculator4.Stock(); // 股票投资(计算时间) break; } else if (key1 == 4) { Calculator4.Rate(); // 计算利率 break; } else if (key1 == 5) { Calculator4.Assets(); // 计算资产总值 break; }else if (key1 ==6 ) { Calculator4.Repayment(); // 计算资产总值 break; }else { System.out.println("\n输入错误!请重新输入!"); } } } private static void Repayment() { // TODO Auto-generated method stub double sum,i; int month; Scanner scanner = new Scanner(System.in); System.out.print("请输入本金:"); double money = scanner.nextDouble(); System.out.print("请输入年利率:"); double rate = scanner.nextDouble(); System.out.print("请输入贷款年数:"); int years = scanner.nextInt(); i=rate/12;//k为月利率 month=years*12;//month为贷款月数 sum=money*i*Math.pow(1+i, month)/(Math.pow(1+i,month)-1); System.out.println("每月等额还款金额为:"+sum); } private static void DanliandFuli() { // TODO 自动生成的方法存根 double N = 1, sum; Scanner scanner = new Scanner(System.in); System.out.println("请输入本金:"); double money = scanner.nextDouble(); System.out.println("请输入存钱年数:"); int years = scanner.nextInt(); System.out.println("请输入年利率:"); double rate = scanner.nextDouble(); sum=money+money*years*rate; System.out.println("单利计算值为:" + sum); sum=0; for (int i = 1; i <= years; i++) { N = (1 + rate) * N; } sum = N * money; System.out.println("复利计算值为:" + sum); } private static void Principal() { // TODO 自动生成的方法存根 double N = 1, money; Scanner scanner = new Scanner(System.in); System.out.println("请输入复利终值:"); double sum = scanner.nextDouble(); System.out.println("请输入存钱年数:"); int years = scanner.nextInt(); System.out.println("请输入年利率:"); double rate = scanner.nextDouble(); for (int i = 1; i <= years; i++) { N = (1 + rate) * N; } money = sum / N; System.out.println("应投入的本金为:" + money); } private static void Stock() { // TODO 自动生成的方法存根 Scanner scanner = new Scanner(System.in); System.out.println("请输入本金:"); double money = scanner.nextDouble(); System.out.println("请输入复利终值:"); int sum = scanner.nextInt(); System.out.println("请输入年利率:"); double rate = scanner.nextDouble(); int years=(int) ((Math.log(sum)/Math.log(1+rate))-(Math.log(money)/Math.log(1+rate))); System.out.println("所需年限为:" + years); } private static void Rate() { // TODO 自动生成的方法存根 double rate; Scanner scanner = new Scanner(System.in); System.out.print("请输入本金:"); double money = scanner.nextDouble(); System.out.print("请输入最后得到资产总值:"); double sum = scanner.nextDouble(); System.out.print("请输入存钱年数:"); int years = scanner.nextInt(); rate=sum/(money*years); System.out.println("利率为:" + rate); } private static void Assets() { // TODO 自动生成的方法存根 double sum; Scanner scanner = new Scanner(System.in); System.out.print("请输入本金:"); double money = scanner.nextDouble(); System.out.print("请输入利率:"); double rate = scanner.nextDouble(); System.out.print("请输入存钱年数:"); int years = scanner.nextInt(); sum=money*rate*years; System.out.println("若投资本金每年固定不变,最后得到的资产总值为:" + sum); sum=0; for(int i=1;i<=years;i++){ sum=money*rate*1; money=sum; } System.out.println("若连本带利投资,最后得到的资产总值为:" + sum); } } 演示结果:
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