java第四次作业
package cc; import java.util.Scanner; public class test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入年份"); int nianfen=input.nextInt(); if ((nianfen%400==0)&&nianfen%4==0||nianfen%100!=0) { System.out.println("闰年"); } else{ System.out.println("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 cc; import java.util.Random; import java.util.Scanner; public class test2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入四位卡号"); int x=input.nextInt(); Random r=new Random(); int a=r.nextInt(10); System.out.println(a); if (x%1000/100==a) { System.out.println("是幸运会员"); } else{ System.out.println("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 test3 { /** * @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值"); int x=input.nextInt(); int y; if (x>0) { y=x+3; System.out.println(y); } if (x==0) { y=0; System.out.println(y); } if (x<0) { y=x*2-1; System.out.println(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 test4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输三个数"); 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("能构成三角行"); }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)
package cc; import java.util.Scanner; public class test1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner s = new Scanner(System.in); System.out.println("请输入年份月份"); int year = s.nextInt(); int month = s.nextInt(); if (month < 1 || month > 12) { return; } if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) { if (month == 2) { System.out.println(29); return; } } if (month == 2) { System.out.println(28); } else if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { System.out.println(31); } else if (month == 4 || month == 6 || month == 9 || month == 11) { System.out.println(30); } } }
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 cc; import java.util.Scanner; public class test2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner s = new Scanner(System.in); System.out.println("请输入分数"); int grade = s.nextInt(); if (grade < 0) { return; } int n = grade / 10; switch (n) { 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"); } } }
3、输入一个数字,判断是一个奇数还是偶数
package cc; import java.util.Scanner; public class test3 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner s=new Scanner(System.in); System.out.println("请输入一个整数"); int a=s.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。
package cc; import java.util.Scanner; public class test4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入一个数"); 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)
package cc; import java.util.Scanner; public class test5 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入一个数"); int x=input.nextInt(); if (x%30==0) { System.out.println("能被5和6整除"); } else if(x%5==0){ System.out.println("能被5整除"); } else if(x%6==0){ System.out.println("能被6整除"); } else if(x%30!=0){ System.out.println("不能被5或6整除"); } } }