1.package test3;
import java.util.*;
public class abc {
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("请输入年份，我将判断是否为闰年");
Scanner input=new Scanner(System.in);
int a = input.nextInt();
if(a%4==0&&a%4!=0) {
System.out.println("是润年");
}else if(a%400==0) {
System.out.println("是润年");
}else {
System.out.println("不是闰年");
}
}
}
2.package chap1;
import java.util.*;
public class Main {
public static void main(String[] args)
{
System.out.println("输入四位会员卡号，我可以判断你是否为幸运会员");
Scanner input=new Scanner(System.in);
int a = input.nextInt();
if(a/100%10%3==0) {
System.out.println("恭喜您，是幸运会员");
}else System.out.println("很抱歉，您不是我们的幸运会员666");
}
}
3.package chap1;
import java.util.*;
public class Main {
public static void main(String[] args)
{
System.out.println("现有已知函数，请输入x的值，我们会输出对应的y值");
Scanner input = new Scanner(System.in);
double x=input.nextDouble();
double y;
if(x>0) {
y=x+3;
System.out.println("对应的y值为"+y);
}else if(x==0) {
y=x;
System.out.println("对应的y值为"+y);
}else if(x<0) {
y=2*x-1;
System.out.println("对应的y值为"+y);
}
}
}
4.package chap1;
import java.util.*;
public class Main {
public static void main(String[] args)
{
System.out.println("请输入三个数，判断能否构成三角形");
Scanner input = new Scanner(System.in);
double a=input.nextDouble();
double b=input.nextDouble();
double c=input.nextDouble();
if(a+b>c) {
if(a+c>b) {
if(b+c>a) {
System.out.println("可以构成三角形");
}
}
else {
System.out.println("不能构成三角形");
}
}else {
System.out.println("不能构成三角形");
}
}
}
