7.9作业

1 判断三角形

判断方法

package com.sanjiaoxin;

public class PdSjx {
        int a;
        int b;
        int c;
        boolean flag;
        public void PanDuan() {
            if(a+b>c&&a+c>b&&a+c>b) {                                                  //判断是否为三角形
                flag = true;
                if((a*a==b*b+c*c)||(b*b==a*a+c*c)||(c*c==a*a+b*b)) {         //判断三角形的类型
                    System.out.println("这是个直角三角形");
                }else if((a*a>b*b+c*c)||(b*b>a*a+c*c)||(c*c>a*a+b*b)) {
                    System.out.println("这是个钝角三角形");
                }else if(a==b&&a==c) {
                    System.out.println("这是个等边三角形");
                }else {
                    System.out.println("这是个锐角三角形");
                }
            }else {
                flag = false;
                System.out.println("这不能构成三角形'");
                
            }

        }
}

测试类

package com.sanjiaoxin;

import java.util.Scanner;

public class Main {
static Scanner sc = new Scanner(System.in);
        public static void main(String[] args) {
            PdSjx l = new PdSjx();
            String answer = null;
            do {
                System.out.print("请输入第一条边：");
                l.a = sc.nextInt();
                System.out.print("请输入第二条边：");
                l.b = sc.nextInt();
                System.out.print("请输入第三条边：");
                l.c = sc.nextInt();
                l.PanDuan();
                System.out.print("继续吗？ y/n：");
                 answer = sc.next();
                
                
            }while("y".equals(answer));
            System.out.println("谢谢使用");
        }
}

2.贷款

计算代码

package com.Money;


public class JieMoney {
        double zlx;//总利息
        int dkje;//贷款金额
        int year;//年限
        double myhkje;//每月还款金额
        public void Money() {
            if(year >=0&&year <= 3) {
                zlx =dkje * 0.0603*year;
                myhkje = (dkje+zlx) /(year*12);
            }else if(year <= 5) {
                zlx =dkje * 0.0613*year;
                myhkje = (dkje+zlx) /(year*12);
            }else {
                zlx =dkje * 0.0639*year;
                myhkje = (dkje+zlx) /(year*12);
            }
            System.out.println("***月供为"+myhkje);
        }
}
测试代码

package com.Money;

import java.util.Scanner;

public class main {
static Scanner sc = new Scanner(System.in);
        public static void main(String[] args) {
            JieMoney k = new JieMoney();
            System.out.print("请输入贷款金额：");
            k.dkje = sc.nextInt();
            System.out.print("请选择贷款年限：");
            System.out.println("1.3年（36个月）"+"	"+"2.5年（60月）"+"	"+"3.20年（240个月）");
            k.year = sc.nextInt();
            k.Money();
        }
}