复利计算

import java.util.Scanner;

public class Fulijisuan {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        double N=1;
        Scanner scanner=new Scanner(System.in);
        System.out.print("若要计算本金请按3否则按0:");
        int num=scanner.nextInt();
        if(num==3){
            double money;
            float year=30;
            float total=3000000;
            double a=0.30;
            for(int j=1;j<=year;j++){
                N=(1+a)*N;
            }
            money=total/N;
            System.out.println("需要本金："+money);
        }
        System.out.print("请选择复利计算(1)or单利计算(2):");
        int choose=scanner.nextInt();
        
        System.out.print("请输入本金：");
        float P=scanner.nextInt();
        System.out.print("请输入利率：");
        float i=scanner.nextFloat();
        System.out.print("存入时间：");
        float n=scanner.nextFloat();
        
        if(choose==1){
            fuli(N, P, i, n);
        }
        else if(choose==2){
            danli(P, i,n);
        }
        
    }

    private static void danli(double P, double i,double n) {
        double G; 
        
        G=P+P*i*n;
        System.out.print("单利终值为："+G);
    }

    private static void fuli(double N, double P, double i, double n) {
        for(int j=1;j<=n;j++){
            
            N=(1+i)*N;
        }
        double F;
        F=P*N;
        System.out.print("复利终值为："+F);
    }


}