复利计算C转java版

 import java.util.Scanner;

 public class Compound_int {

     public static void main(String[] args) {
         tip();
         while (true) {
             menu();
             int n = scanner.nextInt();
             if (n >= 0 && n <= 7) {
                 if (n == 0)
                     break;
                 switch (n) {
                 case 1:
                     benjin();
                     break;
                 case 2:
                     fuli();
                     break;
                 case 3:
                     danli();
                     break;
                 case 4:
                     years();
                     break;
                 case 5:
                     annual_int_rate();
                     break;
                 case 6:
                     YM_Equal_cast_final();
                     break;
                 case 7:
                     Average_capital_plus_interest();
                     break;
                 case 0:
                     n = 0;
                     break;

                 }
             } else {
                 System.out.println("输入超出范围，请重新输入:");

             }
         }
     }

     static Scanner scanner = new Scanner(System.in);

     static void tip()// 计算公式和一些变量的介绍
     {
         System.out.printf("复利计算软件\n");
         System.out.printf("    复利计算公式:F=P*pow((1+i/m),N*m)\n");
         System.out.printf("    单利计算公式:F=P+P*N*i\n");
         System.out.printf("    等额投资公式:F=P*12*(1+i)*(pow(1+i,N)-1)/i\n");
         System.out.printf("\tF:复利终值|年金终值\n");
         System.out.printf("\tP:本金\n");
         System.out.printf("\ti:利率\n");
         System.out.printf("\tN：利率获取时间的整数倍\n");
         System.out.printf("\tm:年复利次数(一年当中的滚利次数)\n");
     }

     static void menu()// 菜单
     {
         System.out.printf("\t\t|-----------------------------------|\n");
         System.out.printf("\t\t|             welcome               |\n");
         System.out.printf("\t\t|-----------------------------------|\n");
         System.out.printf("\t\t|           1:计算本金               |\n");
         System.out.printf("\t\t|           2:计算年复利终值          |\n");
         System.out.printf("\t\t|           3:单利计算               |\n");
         System.out.printf("\t\t|           4:计算年份               |\n");
         System.out.printf("\t\t|           5:计算年利率             |\n");
         System.out.printf("\t\t|           6:等额定投(年|月)         |\n");
         System.out.printf("\t\t|           7:等额还款               |\n");
         System.out.printf("\t\t|           0:结束                   |\n");
         System.out.printf("\t\t|-----------------------------------|\n");
         System.out.printf("请输入你要选择的功能(0~7):");

     }

     static double capital_formula(double F, double i, int N, int m)// 本金计算公式
     {
         double P;
         P = F / Math.pow((1 + i / m), N * m);
         return P;
     }

     static void benjin()// 计算本金
     {
         int N, m;
         double i, F, P;
         System.out.printf("复利终值:");
         F = scanner.nextDouble();
         System.out.printf("年利率:");
         i = scanner.nextDouble();
         System.out.printf("存入年限:");
         N = scanner.nextInt();
         System.out.printf("年复利次数:");
         m = scanner.nextInt();
         P = capital_formula(F, i, N, m);
         System.out.println("年复利终值为" + F + "需要本金为:" + P);
     }

     static double compound_amount_formla(double P, double i, int N, int m)// 复利计算公式
     {
         double F;
         F = P * Math.pow((1 + i / m), N * m);
         return F;
     }

     static void fuli()// 计算复利终值
     {
         int N, m;
         double i, F, P;
         System.out.printf("存入本金:");
         P = scanner.nextDouble();
         System.out.printf("年利率:");
         i = scanner.nextDouble();
         System.out.printf("存入年限:");
         N = scanner.nextInt();
         System.out.printf("年复利次数:");
         m = scanner.nextInt();
         F = compound_amount_formla(P, i, N, m);
         System.out.println("复利终值:" + F);
     }

     static double simple_interest_formula(double P, int N, double i)// 单利计算公式
     {
         double F;
         F = P + P * N * i;
         return F;
     }

     static void danli()// 单利计算
     {
         int N;
         double i, F, P;
         System.out.printf("存入本金:");
         P = scanner.nextDouble();
         System.out.printf("年利率:");
         i = scanner.nextDouble();
         System.out.printf("存入年限:");
         N = scanner.nextInt();
         F = simple_interest_formula(P, N, i);
         System.out.println("本息和为:" + F);
     }

     static int years_formula(double F, double P, double i, int m)// 根据复利终值求年份
     {
         int year;
         year = (int) (Math.log(F / P) / Math.log(1 + i / m) / m);
         return year;
     }

     static void years()// 求年份
     {
         int N, m;
         double i, F, P;
         System.out.printf("复利终值:");
         F = scanner.nextDouble();
         System.out.printf("存入本金:");
         P = scanner.nextDouble();
         System.out.printf("年利率:");
         i = scanner.nextDouble();
         System.out.printf("年复利次数:");
         m = scanner.nextInt();
         N = years_formula(F, P, i, m);
         System.out.println("从" + P + "到" + F + "需要" + N + "年");
     }

     static double rate_formula(int m, double F, double P, int N)// 复利的利率计算公式
     {
         double rate;
         rate = m * (Math.pow(F / P, 1.0 / (N * m)) - 1);
         return rate;
     }

     static void annual_int_rate()// 计算年利率
     {
         int N, m;
         double i, F, P;
         System.out.printf("复利终值:");
         F = scanner.nextDouble();
         System.out.printf("存入本金:");
         P = scanner.nextDouble();
         System.out.printf("存入年限:");
         N = scanner.nextInt();
         System.out.printf("年复利次数:");
         m = scanner.nextInt();
         i = rate_formula(m, F, P, N);
         System.out.println("从" + P + "到" + F + "需要" + i);
     }

     static double according_year_formula(double P, int N, double i)// 按照年份等额投资计算公式
     {
         double final_value;
         final_value = P * (Math.pow(1 + i, N) - 1) / i;
         return final_value;
     }

     static double according_month_formula(double P, int N, double i)// 按照月份等额投资计算公式
     {
         double final_value;
         final_value = P * 12 * (1 + i) * (Math.pow(1 + i, N) - 1) / i;
         return final_value;
     }

     static void YM_Equal_cast_final()// 计算等额投资
     {
         int N, n;
         double i, F, P;
         System.out.printf("\t\t1:按年投资\n\t\t2:按月投资\n");
         System.out.printf("请选择你要的功能<1|2>:");
         n = scanner.nextInt();
         if (n == 1) {
             System.out.printf("存入本金:");
             P = scanner.nextDouble();
             System.out.printf("存入年限:");
             N = scanner.nextInt();
             System.out.printf("年利率:");
             i = scanner.nextDouble();
             F = according_year_formula(P, N, i);
             System.out.println(N + "年后的总产值:" + F);

         } else if (n == 2) {
             System.out.printf("存入本金:");
             P = scanner.nextDouble();
             System.out.printf("存入年限:");
             N = scanner.nextInt();
             System.out.printf("年利率:");
             i = scanner.nextDouble();
             F = according_month_formula(P, N, i);
             System.out.println(N + "年后的总产值:" + F);
         } else {
             System.out.printf("输入有误!\n");
         }

     }

     static double Average_capital_plus_interest_formula(double F, int N,double i)// 等额还款公式
     {
         double refund;
         refund = F * i / (12 * (1 + i) * (Math.pow(1 + i, N) - 1));
         return refund;
     }

     static void Average_capital_plus_interest()// 等额还款
     {
         int N;
         double i, F, P;
         System.out.printf("贷款金额:");
         F = scanner.nextDouble();
         System.out.printf("存入年限:");
         N = scanner.nextInt();
         System.out.printf("年利率:");
         i = scanner.nextDouble();
         P = Average_capital_plus_interest_formula(F, N, i);
         System.out.println("贷款" + F + "每月需要还款" + P);
     }

 }