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 lwm1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入一个年份"); int a = input.nextInt(); if (a % 4 == 0 && a % 100 != 0 || a % 400 == 0) { System.out.println("闰年"); } else { System.out.println("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 lwm4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); Random r = new Random(); System.out.println("输入一个四位数"); int a = input.nextInt(); int b = r.nextInt(); if (a % 1000 / 100 == b) { System.out.println("幸运会员"); } else { System.out.println("不是"); } } }
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 lwm2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入x值"); int x = input.nextInt(); int y; if (x > 0) { y = x + 3; System.out.println("y=" + y); } if (x == 0) { y = 0; System.out.println("y=" + y); } if (x < 0) { 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 lwm3 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入三个数"); int a = input.nextInt(); int b = input.nextInt(); int c = input.nextInt(); if (a + b > c || a + c > b || b + c > a) { System.out.println("可以构成三角形"); } else { System.out.println("不能构成三角形"); } } }
作业
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 lwm1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入年月份"); int a = input.nextInt(); int b = input.nextInt(); if (a % 4 == 0 && a % 100 != 0 || a % 400 == 0) { switch (b) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: System.out.println("31天"); break; case 2: System.out.println("29天"); break; default: System.out.println("30天"); } } else { switch (b) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: System.out.println("31天"); break; case 2: System.out.println("28天"); break; default: System.out.println("30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 lwm2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入x值"); 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 lwm3 { /** * @param args */ 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 lwm4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入x"); int x = input.nextInt(); switch (x) { case 1: System.out.println(x); break; case 5: System.out.println(x); break; case 10: System.out.println(x); break; default: System.out.println("x=none"); break; } } }
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 lwm5 { /** * @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"); } } }