复利计算1.0

import java.text.DecimalFormat;
import java.util.Scanner;

public class fulijisuanqi01 {
    static Scanner scanner = new Scanner(System.in);
    static DecimalFormat df = new DecimalFormat("####0.0000");

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        System.out.println("1.复利计算；");
        System.out.println("2.单利计算；");
        System.out.println("3.本金计算；");
        System.out.println("4.年限计算。"); 
　　　　 System.out.println("请选择：");

        int k = scanner.nextInt();
        switch (k) {
        case 1:
            fulijisuan();
            break;
        case 2:
            danlijisuan();
            break;
        case 3:
            benjinjisuan();
            break;
        case 4:
            nianxianjisuan();
        default:
            break;
        }
    }

    private static void nianxianjisuan() {
        // TODO Auto-generated method stub
        System.out.println("本金是：");
        double P = scanner.nextDouble();
        System.out.println("利率是：");
        double i = scanner.nextDouble();
        System.out.println("复利终值是：");
        double F = scanner.nextDouble();
        int n = (int) (Math.log(F / P) / Math.log(1 + i));
        System.out.println("年限是：" + n);
    }

    private static void benjinjisuan() {
        // TODO Auto-generated method stub
        System.out.println("复利终值是：");
        double F = scanner.nextDouble();
        System.out.println("利率是：");
        double i = scanner.nextDouble();
        System.out.println("年限是：");
        int n = scanner.nextInt();
        double P;
        P = F / Math.pow(1 + i, n);
        String p = df.format(P);
        System.out.println("本金是：" + p);
    }

    private static void danlijisuan() {
        // TODO Auto-generated method stub
        System.out.println("本金是：");
        double P = scanner.nextDouble();
        System.out.println("利率是：");
        double i = scanner.nextDouble();
        System.out.println("年限是：");
        int n = scanner.nextInt();
        double F;
        F = P * (1 + i * n);
        String f = df.format(F);
        System.out.println("单利终值是：" + f);
    }

    private static void fulijisuan() {
        System.out.println("本金是：");
        double P = scanner.nextDouble();
        System.out.println("利率是：");
        double i = scanner.nextDouble();
        System.out.println("年限是：");
        int n = scanner.nextInt();
        double F;
        F = P * Math.pow(1 + i, n);
        String f = df.format(F);
        System.out.println("复利终值是：" + f);
    }

}



     

功能：
1.可以通过本金计算复利终值；
2.可以通过复利终值计算本金；
3.可以通过本金计算单利终值；
4.可以通过本金和复利终值计算存储年限。