第三周作業 1.輸入一個年份,判斷是不是閏年(能被4整除但不能被100整除,或者能被400整除) 2.輸入一個4位會員卡號,如果百位數字是3的倍數,就輸出是幸運會員,否則就輸出不是. 3.已知函數,輸入x的值,輸出對應的y的值. x + 3 ( x > 0 ) y = 0 ( x = 0 ) x2 –1 ( x < 0 ) 4.輸入三個數,判斷能否構成三角形(任意兩邊之和大於第三邊)

package kljjjjj;

public class kljjjjj {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
            System.out.println("輸入年份");
            int year=2020;
            if  ( ( 2020 % 4==0 && 2020 % 100!=0)||(2020%400!=0)) {
                System.out.println("閏年");
            }
            else {
                System.out.println("不是閏年");
            }
    } 

package kljjjjjj;
import java.util.*;
public class kljjjjjj {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        
            int x=input.nextInt();
            int y;
            if(x>0)
                y=x+3;
            else if(x < 0)
                y=0;
            System.out.println("y");
                
            
    }

package kljjjjjjj;
    import java.util.Scanner;
    public class kljjjjjjj {
    public static void main(String[] args) {
    Scanner AA = new Scanner(System.in);
    System.out.println("輸入三個正整數");
    int a = AA.nextInt();
    int b = AA.nextInt();
    int c = AA.nextInt();
    if (a<=0||b<=0||c<=0){
    System.out.println("輸入錯誤，請重新輸入");
    }else if ((a+b)>c&&(a+c)>b&&(b+c)>a){
    System.out.println("能構成三角形");
    }else
    System.out.println("不能構成三角形");
    }
    }

//2.輸入一個4位會員卡號,如果百位數字是3的倍數,就輸出是幸運會員,否則就輸出不是.
    @SuppressWarnings("resource")
        Scanner sc=new Scanner(System.in);
        int a=sc.nextInt();
        int b=a%1000/100;
        if(a>999||a<10000) {//判斷輸入是否正確
            if(b%3==0) {
                System.out.println("恭喜您為我們的幸運會員");
            }else{
                System.out.println("很抱歉您不是我們的幸運會員");
            }
        }else {
            System.out.println("輸入錯誤請重新輸入");
        }