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);
}
}