面向对象java第四次作业
1.输入一个年份,判断是不是闰年(能被4整除但不能被100整除,或者能被400整除)
import java.util.Scanner; public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入年"); int a = input.nextInt(); if (a % 4 == 0 && a % 100 != 0 || a % 400 == 0) { System.out.println("是"); } else { System.out.println("不是"); } } }
2.输入一个4位会员卡号,如果百位数字是随机数,就输出是幸运会员,否则就输出不是
import java.util.Random; import java.util.Scanner; public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入会员号"); int a = input.nextInt(); Random r = new Random(); int b = r.nextInt(10); if (a % 1000 / 100 == b) { System.out.println("是"); } else { System.out.println("不是"); } } }
3.已知函数,输入x的值,输出对应的y的值
import java.util.Scanner; public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入x"); int x = input.nextInt(); if (x > 0) { System.out.println(x + 3); } else if (x == 0) { System.out.println(0); } else if (x < 0) { System.out.println(x * 2 - 1); } } }
4.输入三个数,判断能否构成三角形(任意两边之和大于第三边)
import java.util.Scanner; public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入a"); int a = input.nextInt(); System.out.println("请输入b"); int b = input.nextInt(); System.out.println("请输入c"); int c = input.nextInt(); if (a + b > c) { System.out.println("是"); } else if (b + c > a) { System.out.println("是"); } else if (a + c > b) { System.out.println("是"); } else { System.out.println("不是"); } } }
5.输入年份月份,输出该月的天数(闰年2月29天,条件参考上机练习1)
import java.util.Scanner; public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入年"); int a = input.nextInt(); System.out.println("请输入月"); int b = input.nextInt(); if (b == 4 && b == 6 && b == 9 && b == 11) { System.out.println("30"); } else if (b == 1 && b == 3 && b == 5 && b == 7 && b == 8 && b == 10 && b == 12) { System.out.println("31"); } else if (a % 4 == 0 && a % 100 != 0 || a % 400 == 0 && b == 2) { System.out.println("29"); } else { System.out.println("28"); } } }
6.给定一个成绩a,使用switch结构求出a的等级
。A:90-100,B:80-89,C:70-79,D:60-69,E:0~59
import java.util.Scanner; public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入成绩"); int a = input.nextInt(); switch (a / 10) { case 9: System.out.println("A"); break; case 8: System.out.println("B"); break; case 7: System.out.println("C"); break; case 6: System.out.println("D"); break; default: System.out.println("E"); break; } } }
7.输入一个数字,判断是一个奇数还是偶数
import java.util.Scanner; public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入"); int a = input.nextInt(); if (a % 2 == 0) { System.out.println("偶数"); } else { System.out.println("奇数"); } } }
8.编写程序, 判断一个变量x的值,如果是1, 输出x=1,如果是5,输出x=5,如果是 10,输出 x=10,除了以上几个值,都输出x=none
import java.util.Scanner; public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入"); int a = input.nextInt(); switch (a) { case 1: System.out.println("1"); break; case 5: System.out.println("5"); break; case 10: System.out.println("10"); break; default: System.out.println("none"); break; } } }
9.判断一个数字是否能被5和6同时整除(打印能被5和6整除),或只能被5整除(打印能被5整除 ),或只能被6整除,(打印能被6整除),不能被5或6整除,(打印不能被5或6整除)
import java.util.Scanner; public class TestHello { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); int a = input.nextInt(); if (a % 5 == 0 && a % 6 == 0) { System.out.println("能被5和6整除"); } else if (a % 5 == 0 && a % 6 != 0) { System.out.println("能被5整除"); } else if (a % 6 == 0 && a % 5 != 0) { System.out.println("能被6整除"); } else { System.out.println("不能被5或6整除"); } } }