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)
package exe2; import java.util.Scanner; public class text6 { public text6() { // TODO Auto-generated constructor stub } public static void main(String[] args) { Scanner input=new Scanner(System.in); System.out.println("输入一个年份"); int year=input.nextInt(); if (year%4==0&&year%100!=0||year%400==0) { System.out.println("这是闰年"); }else { System.out.println("这不是闰年"); } } }
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 exe2; import java.util.Random; 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("输入四个数字"); int number = input.nextInt(); int baiwei = number/100%10; Random r = new Random(); int a=r.nextInt(10); if (baiwei==a) { System.out.println("您是幸运会员"); }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 )
package exe2; 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x的值"); int x= input.nextInt(); int y=0; if (x>0) { y=x+3; }else if (x==3) { 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)
package exe2; 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("可以成为三角形"); }else { System.out.println("不能"); } } }
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)
package exe2; import java.util.Scanner; public class text { 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(); System.out.println("输入月份"); int month = input.nextInt(); switch (month) { case 4: case 6: case 9: case 11: System.out.println("该月有30天"); break; case 2: 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"); } break; default: System.out.println("该月有31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
package exe2; 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("给定一个值"); int a=input.nextInt(); switch (a/10) { case 10: System.out.println("A"); case 9: System.out.println("A"); case 8: System.out.println("B"); case 7: System.out.println("C"); case 6: System.out.println("D"); default: System.out.println("E"); } } }
3、输入一个数字,判断是一个奇数还是偶数
package exe2; 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("输入一个数"); int a = input.nextInt(); if (a / 2 == 0) { System.out.println("这是偶数"); } else { System.out.println("这是奇数"); } } }
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。
package exe2; 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("输入一个数"); int x = input.nextInt(); switch (x) { case 1: System.out.println("x=1"); break; case 5: System.out.println("x=5"); break; case 10: System.out.println("x=10"); break; default: 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)
package exe2; import java.util.Scanner; public class text5 { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("输入一个数字"); 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) { System.out.println("能被5整除"); } else if (a % 6 == 0) { System.out.println("能被6整除"); } else { System.out.println("不能被5或6整除"); } } // TODO Auto-generated method stub }