1.输入一个年份,判断是不是闰年
package homework4; import java.util.Scanner; public class Work1 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入年份"); int year=input.nextInt(); if (year%4==0&&year%100!=0||year%400==0) { System.out.println("是闰年"); } 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 test; 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); Random r=new Random(); System.out.println("输入四位会员卡号"); int num=input.nextInt(); int a=r.nextInt(10); System.out.println(a); if(num/100%10==a){ System.out.println("是会员"); } else{ System.out.println("不是会员"); } } }
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 )
package homework4; import java.util.Scanner; public class Work3 { /** * @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的值"); int x=input.nextInt(); int y=0; if(x>0){ y=x+3; } else if(x==0){ y=0; } else 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)
package test; 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("输入a"); int a=input.nextInt(); System.out.println("输入b"); int b=input.nextInt(); System.out.println("输入c"); int c=input.nextInt(); if(a+b>c&&a+c>b&&b+c>a){ System.out.println("是三角形"); }else{ System.out.println("不是三角形"); } } }
5 输入年份月份,输出该月的天数
package homework4; import java.util.Scanner; public class Work5 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入年份和月份"); int a=input.nextInt(); int b=input.nextInt(); if((a%4==0 && a%100!=0) || a%400==0){ if(b==1 || b==3 || b==5 || b==7 || b==8 || b==10 || b==12){ System.out.println(31); } else if(b==2){ System.out.println(29); } else{ System.out.println(30); } } else{ if(b==1 || b==3 || b==5 || b==7 || b==8 || b==10 || b==12){ System.out.println(31); } else if(b==2){ System.out.println(28); } else{ System.out.println(30); } } } }
6.给定一个成绩a,使用switch结构求出a的等级
package homework4; import java.util.Scanner; public class Work6 { /** * @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 a=input.nextInt(); switch(a/10){ case 10: System.out.println("A"); break; 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"); break; } } }
7.输入一个数字,判断是一个奇数还是偶数
package test; import java.util.Scanner; public class test7 { /** * @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 a=input.nextInt(); if(a%2==0){ System.out.println("这个数是偶数"); }else{ System.out.println("这个数是奇数"); } } }
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 homework4; import java.util.Scanner; public class Work8 { /** * @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的值"); 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"); } } }
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 homework4; import java.util.Scanner; public class Work9 { /** * @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%5==0 && x%6==0){ System.out.println("能被5和6整除"); } else if(x%5==0 && x%6!=0){ System.out.println("只能被5整除"); } else if(x%5!=0 && x%6==0){ System.out.println("只能被6整除"); } else if(x%5!=0 && x%6!=0){ System.out.println("不能被5和6整除"); } } }