年利率 矩阵相乘 输出等腰三角形

【核心代码】

package interest;

import java.util.Scanner;

public class interest {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner input = new Scanner(System.in);
		double money =0;
		double interest=0;
		int year=0;
		int flag=0;
		do{
				System.out.println("请输入存款本金:");
				if(input.hasNextDouble()){
					money=input.nextDouble();
					if(money>0){
						flag=1;
					}
					else{
						System.out.println("输入格式有误,请重新输入");
					}
				}
				else{
					System.out.println("输入格式有误,请重新输入");
					input.next();
				}
		}
		while(flag==0);
		flag=0;
		do {
			System.out.println("请输入年利率:");
			if (input.hasNextDouble()) {
				interest = input.nextDouble();
				if (interest > 0) {
					flag = 1;
				} else {
					System.out.println("输入格式有误,请重新输入");
				}
			} else {
				System.out.println("输入格式有误,请重新输入");
				input.next();
			}
		} while (flag == 0);
			
		flag=0;
		do {
			System.out.println("请输入存款年限:");
			if (input.hasNextInt()) {
				year = input.nextInt();
				if (year > 0) {
					flag = 1;
				} else {
					System.out.println("输入格式有误,请重新输入");
				}
			} else {
				System.out.println("输入格式有误,请重新输入");
				input.next();
			}
		} while (flag == 0);
		
		double sum =money*Math.pow((1 interest),year);
		System.out.println("存款总额为:" sum);

		input.close();
	}

}