第4周上机练习+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 com.homework; import java.util.Scanner; public class homework3 { /** * @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 year=input.nextInt(); if(year%4==0&&year%100!=0||year%400==0) { System.out.println("YES"); } else { System.out.println("no"); } } }
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 com.homework; import java.util.Random; import java.util.Scanner; public class homework4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); Random r=new Random(); int c=r.nextInt(10); System.out.println("输入会员号"); int a=input.nextInt(); int b=a/100%10; System.out.println(c); if(b==c) { System.out.println("yes"); } else { System.out.println("NO"); } } }
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 KTLX; 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("SHURU X"); int x=input.nextInt(); int y; if(x>0) { System.out.println(y=x+3); } else if(x==0) { System.out.println(y=0); } else { System.out.println(y=x*2-1); } } }
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 com.homework; import java.util.Scanner; public class homework4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("num1"); int a=input.nextInt(); System.out.println("num2"); int b=input.nextInt(); System.out.println("num3"); int c=input.nextInt(); if(a+b>c&&a+c>b&&b+c>a) { System.out.println("YES"); } else { System.out.println("NO"); } } }
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 com.homework; import java.util.Scanner; public class homework1 { /** * @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 year = input.nextInt(); System.out.println("请输入月份"); int month = input.nextInt(); int day; if (((year%4==0&&year%100!=0)||year%400==0)&&month==2) { day=29; System.out.println("该月的天数为"+day); } else if(month==1) { day=31; System.out.println("该月的天数为"+day); }else if(month==2) { day=28; System.out.println("该月的天数为"+day); }else if(month==3) { day=31; System.out.println("该月的天数为"+day); }else if(month==4) { day=30; System.out.println("该月的天数为"+day); }else if(month==5) { day=31; System.out.println("该月的天数为"+day); }else if(month==6) { day=30; System.out.println("该月的天数为"+day); }else if(month==7) { day=31; System.out.println("该月的天数为"+day); }else if(month==8) { day=31; System.out.println("该月的天数为"+day); }else if(month==9) { day=30; System.out.println("该月的天数为"+day); }else if(month==10) { day=31; System.out.println("该月的天数为"+day); }else if(month==11) { day=30; System.out.println("该月的天数为"+day); }else if(month==12) { day=31; System.out.println("该月的天数为"+day); } } }
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 com.homework; import java.util.Scanner; public class homework2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入成绩"); int grade=input.nextInt(); switch(grade/10) { case 10: System.out.println("等级为A"); break; case 9: System.out.println("等级为A"); break; case 8: System.out.println("等级为B"); break; case 7: System.out.println("等级为C"); break; case 6: System.out.println("等级为D"); break; default: System.out.println("等级为E"); break; } } }
3、输入一个数字,判断是一个奇数还是偶数
package com.homework; import java.util.Scanner; public class homework4 { /** * @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"); int x=input.nextInt(); if(x%2==0) { System.out.println("X是偶数"); } else { System.out.println("X=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 com.homework; import java.util.Scanner; public class homework4 { /** * @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"); int x=input.nextInt(); if(x==1) { System.out.println("X="+x); } else if(x==5) { System.out.println("X="+x); } else if(x==10) { System.out.println("X="+x); } 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 com.homework; import java.util.Scanner; public class homework5 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("请输入一个数字"); int num=input.nextInt(); if(num%5==0&&num%6==0) { System.out.println("能被5和6整除"); } else if(num%5==0) { System.out.println("能被5整除"); } else if(num%6==0) { System.out.println("能被6整除"); } else { System.out.println("不能被5或者6整除"); } } }