Java第四次上机作业
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 home1 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("请输入一个年份"); int year = input.nextInt(); if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) { System.out.println("是闰年"); } else { System.out.println("是平年"); } } }
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 home2 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("请输入一个四位卡号"); int a = input.nextInt(); Random r = new Random(); int b = r.nextInt(10); System.out.println("随机数是" + b); if (a / 100 % 10==b) { System.out.println("该用户是幸运会员"); } else { System.out.println("该用户不是幸运会员"); } } }
3.已知函数,输入x的值,输出对应的y的值.
x + 3 ( x > 0 )
y = 0 ( x = 0 )
x*2 –1 ( x < 0 )
import java.util.Scanner; public class home3 { public static void main(String[] args) { Scanner input = new Scanner(System.in); int y = 0; System.out.println("请输入x的数值"); int x = input.nextInt(); if (x > 0) { y = x + 3; } else if (x == 0) { y = 0; } else { y = x * 2 - 1; } System.out.println("y=" + y); } }
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 home4 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("请输入三边"); int x = input.nextInt(); int y = input.nextInt(); int z = input.nextInt(); if (x + y > z && x + z > y && y + z > x) { System.out.println("可以构成三角形"); } else { System.out.println("不可以构成三角形"); } } }
1 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 test1 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入年月份"); int year = input.nextInt(); int month = input.nextInt(); if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { System.out.println("该月有31天"); } else if (month == 4 || month == 6 || month == 9 || month == 11) { System.out.println("该月有30天"); } else if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) { System.out.println("该月有29天"); } else { System.out.println("该月有28天"); } } }
2、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 test2 { 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: case 10: 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; } } }
3、输入一个数字,判断是一个奇数还是偶数
import java.util.Scanner; public class test3 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入一个数字"); int a = input.nextInt(); if (a % 2 == 0) { System.out.println("偶数"); } else { System.out.println("奇数"); } } }
4、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 test4 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入x的数值"); int x = input.nextInt(); if (x == 1) { System.out.println("x=1"); } else if (x == 5) { System.out.println("x=5"); } else if (x == 10) { System.out.println("x=10"); } else { System.out.println("x=none"); } } }
5、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 test5 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入数字"); int a = input.nextInt(); if (a % 5 == 0 && a % 6 == 0) { System.out.println("能被5和6同时整除"); } else if (a % 5 == 0) { System.out.println("能被5整除"); } else if (a % 6 == 0) { System.out.println("能被6整除"); } else if (a % 5 != 0 || a % 6 != 0) { System.out.println("不能被5或6整除"); } else { System.out.println("error"); } } }