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)
package chap3; import java.util.Scanner; public class text1 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入年份"); int year = input.nextInt(); if (year % 4 == 0 && year%100!=100 || year % 400 == 0) { System.out.println("该年份为闰年"); } else { System.out.println("该年份是平年"); } } }
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.
package chap3; import java.util.Random; import java.util.Scanner; public class text2 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入一个四位卡号"); int card = input.nextInt(); Random r = new Random(); int a = r.nextInt(10); System.out.println("输出随机数" + a); if (card / 100 % 10 == a) { System.out.println("该用户为幸运会员"); } else { System.out.println("该用户不是幸会会员"); } } }
3.已知函数,输入x的值,输出对应的y的值.
package chap3; import java.util.Scanner; public class text3 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入一个值x"); int x = input.nextInt(); int y1 = x + 3; int y2 = 0; int y3 = x * 2 - 1; if (x > 0) { System.out.println("y的值为" + y1); } else if (x == 0) { System.out.println("y的值为" + y2); } else if (x < 0) { System.out.println("y的值为" + y3); } } }
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)
package chap3; import java.util.Scanner; public class text4 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入三个数"); int a = input.nextInt(); int b = input.nextInt(); int c = input.nextInt(); if (a + b > c && b + c > a && a + c > b) { System.out.println("可以构成三角形"); } else { System.out.println("不能构成三角形"); } } }
作业
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)
package chap3; import java.util.Scanner; public class text5 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入年份及其月份"); int year = input.nextInt(); int month = input.nextInt(); if (year % 4 == 0 && year%100!=100 || year % 400 == 0) { switch(month){ case 2: System.out.println("该月天数为"+29); break; case 1: case 3: case 5: case 7: case 8: case 10: case 12: System.out.println("该月天数为"+31); break; default: System.out.println("该月天数为"+30); break; } } else { switch(month){ case 2: System.out.println("该月天数为"+28); break; case 1: case 3: case 5: case 7: case 8: case 10: case 12: System.out.println("该月天数为"+31); break; default: System.out.println("该月天数为"+30); break; } } } }
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
package chap3; import java.util.Scanner; public class text6 { 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("成绩为A"); break; case 8: System.out.println("成绩为B"); break; case 7: System.out.println("成绩为C"); break; case 6: System.out.println("成绩为D"); break; default: System.out.println("成绩为E"); break; } } }
7、输入一个数字,判断是一个奇数还是偶数
package chap3; import java.util.Scanner; public class text7 { 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"); int a = input.nextInt(); if (a % 2 == 0) { System.out.println("该数为偶数"); } else { System.out.println("该数为奇数"); } } }
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。
package chap3; import java.util.Scanner; public class text8 { 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"); 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)
package chap3; import java.util.Scanner; public class text9 { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入一个数"); int a = input.nextInt(); if (a % 5 == 0 && a % 6 == 0) { System.out.println("这个数可以被5和6整除"); } else if (a % 5 == 0) { System.out.println("这个数只能被5整除"); } else if (a % 6 == 0) { System.out.println("这个数只能被6整除"); } else if (a % 5 == 0 || a % 6 == 0) { System.out.println("这个数不能被5或6整除"); } } }