算复利条件下等额还款金额

  1 import java.util.Scanner;
  2 
  3 public class exercise {
  4 
  5     public static void main(String[] args) {
  6         int select;
  7         do {
  8             System.out.println("请问您想要进行单利计算还是复利计算：1.单利 2.复利");
  9             Scanner keyin0 = new Scanner(System.in);
 10             select = keyin0.nextInt();
 11         } while (select != 1 && select != 2);
 12         System.out.println("请输入您想要存储的金额数量：");
 13         Scanner keyin1 = new Scanner(System.in);
 14         double originalMoney = keyin1.nextDouble();
 15         System.out.println("请输入您想要存储金额的时间(年):");
 16         Scanner keyin2 = new Scanner(System.in);
 17         int year = keyin2.nextInt();
 18         System.out.println("请输入您想要设计的年利率：");
 19         Scanner keyin3 = new Scanner(System.in);
 20         double rate = keyin3.nextDouble();
 21         double sumValue = originalMoney;
 22         if (select == 1) {
 23             double singleValue = originalMoney * (1 + rate * year);
 24             System.out.println("存入第" + year + "年后的存款总额为：" + singleValue);
 25             do {
 26                 System.out.println("请问您想要计算本金问题吗：1.需要 2.不需要");
 27                 select = new Scanner(System.in).nextInt();
 28             } while (select != 1 && select != 2);
 29             if (select == 1) {
 30                 System.out.println("请输入您想要筹到的金额：");
 31                 singleValue = new Scanner(System.in).nextDouble();
 32                 System.out.println("请输入您想要存储金额的时间(年):");
 33                 year = new Scanner(System.in).nextInt();
 34                 System.out.println("请输入您想要设计的年利率：");
 35                 rate = new Scanner(System.in).nextDouble();
 36                 originalMoney = singleValue / (1 + rate * year);
 37                 System.out.println("需要本金" + originalMoney + "元");
 38             }
 39         } 
 40         else {
 41             for (int i = 1; i <= year; i++) {
 42                 sumValue = (1 + rate) * sumValue;
 43 
 44             }
 45             System.out.println("存入第" + year + "年后的存款总额为：" + sumValue);
 46             do {
 47                 System.out.println("请问您想要计算本金问题吗：1.需要 2.不需要");
 48                 select = new Scanner(System.in).nextInt();
 49             } while (select != 1 && select != 2);
 50             if (select == 1) {
 51                 System.out.println("请输入您想要筹到的金额：");
 52                 sumValue = new Scanner(System.in).nextDouble();
 53                 System.out.println("请输入您想要存储金额的时间(年):");
 54                 year = new Scanner(System.in).nextInt();
 55                 System.out.println("请输入您想要设计的年利率：");
 56                 rate = new Scanner(System.in).nextDouble();
 57                 for (int i = 1; i <= year; i++) {
 58                     sumValue = sumValue / (1 + rate);
 59 
 60                 }
 61                 originalMoney = sumValue;
 62                 System.out.println("需要本金" + originalMoney + "元");
 63             }
 64             do {
 65                 System.out.println("请问您想要计算时间问题吗：1.需要 2.不需要");
 66                 select = new Scanner(System.in).nextInt();
 67             } while (select != 1 && select != 2);
 68             if (select == 1) {
 69                 System.out.println("请输入您想要存储的金额数量：");
 70                 originalMoney = new Scanner(System.in).nextDouble();
 71                 System.out.println("请输入到期后您想要获取的金额：");
 72                 sumValue = new Scanner(System.in).nextDouble();
 73                 System.out.println("请输入您想要设计的年利率：");
 74                 rate = new Scanner(System.in).nextDouble();
 75                 year = 1;
 76                 for (; sumValue > originalMoney; year++) {
 77                     originalMoney = originalMoney * (1 + rate);
 78 
 79                 }
 80                 year--;
 81                 System.out.println("需要" + year + "年时间");
 82             }
 83             do {
 84                 System.out.println("请问您想要计算利率问题吗：1.需要 2.不需要");
 85                 select = new Scanner(System.in).nextInt();
 86             } while (select != 1 && select != 2);
 87         //}while (select != 1 && select != 2);
 88         if (select == 1) {
 89             System.out.println("请输入您想要存储的金额数量：");
 90             originalMoney = new Scanner(System.in).nextDouble();
 91             System.out.println("请输入到期后您想要获取的金额：");
 92             sumValue = new Scanner(System.in).nextDouble();
 93             System.out.println("请输入您想要存储金额的时间(年):");
 94             year = new Scanner(System.in).nextInt();
 95             rate = 0;
 96             for (; Math.log(sumValue / originalMoney) / Math.log(rate + 1) > year; rate = rate + 0.0001) {
 97                 continue;
 98             }
 99             System.out.println("年利率应为：" + rate);
100 
101         }
102         do {
103             System.out.println("请问您想要计算每年或者每月拿出固定金额投资吗：1.需要 2.不需要");
104             select = new Scanner(System.in).nextInt();
105         } while (select != 1 && select != 2);
106         if(select==1){
107             do {
108                 System.out.println("请问您想要投资额是以月计算还是以年计算：1.月 2.年");
109                 select = new Scanner(System.in).nextInt();
110             } while (select != 1 && select != 2);
111             if(select==1){
112                 System.out.println("请问您想每个月定期投资多少：");
113                 originalMoney = new Scanner(System.in).nextDouble();
114                 System.out.println("请输入您想要设计的月利率：");
115                 double rateMonth = new Scanner(System.in).nextDouble();
116                 System.out.println("请输入您想要存储金额的时间(月):");
117                 int month = new Scanner(System.in).nextInt();
118                 sumValue=0;
119                 for (int i = 1; i <= month; i++) {
120                     sumValue = (1 + rateMonth) * (sumValue+originalMoney);
121 
122                 }
123                 System.out.println(""+month+"个月后资产总值将变为："+sumValue);
124             }
125             if(select==2){
126                 System.out.println("请问您想每年定期投资多少：");
127                 originalMoney = new Scanner(System.in).nextDouble();
128                 System.out.println("请输入您想要设计的年利率：");
129                 rate = new Scanner(System.in).nextDouble();
130                 System.out.println("请输入您想要存储金额的时间(年):");
131                 year = new Scanner(System.in).nextInt();
132                 sumValue=0;
133                 for (int i = 1; i <=year; i++) {
134                     sumValue = (1 + rate) * (sumValue+originalMoney);
135 
136                 }
137                 System.out.println(""+year+"年后资产总值将变为："+sumValue);
138             }
139         }
140         do {
141             System.out.println("请问您想要计算贷款问题吗：1.需要 2.不需要");
142             select = new Scanner(System.in).nextInt();
143         } while (select != 1 && select != 2);
144         if(select==1)
145         {
146             System.out.print("请输入贷款金额：");
147             originalMoney=new Scanner(System.in).nextDouble();
148             System.out.print("请输入贷款的时间期限(年)：");
149             year=new Scanner(System.in).nextInt();
150             System.out.print("请输入贷款的年利率：");
151             rate=new Scanner(System.in).nextDouble();
152             sumValue=originalMoney;
153             for (int i = 1; i <= year; i++) {
154                 sumValue = (1 + rate) * sumValue;
155 
156             }
157             
158             double returnPay=sumValue/(year*12);
159             System.out.println("每个月应该偿还"+returnPay);
160             
161         }
162 
163     }
164 
165 }
166 }
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原文地址：https://www.cnblogs.com/57rongjielong/p/5295774.html