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 homework4; import java.util.Scanner; public class Text1 { /** * @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 nianFen=input.nextInt(); if(nianFen%4==0&&nianFen%100==0||nianFen%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.
package homework4; import java.util.Random; import java.util.Scanner; public class Text2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入四位数"); int a=input.nextInt(); int baiWei=a%1000/100; Random r=new Random(); int b=r.nextInt(10); System.out.println(b); if(baiWei==b){ 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 )
package homework4; import java.util.Scanner; public class Text3 { /** * @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等于"+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 homework4; import java.util.Scanner; public class Text4 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入三角形的三个边"); System.out.println("a="); int a=input.nextInt(); System.out.println("b="); int b=input.nextInt(); System.out.println("c="); int c=input.nextInt(); if(a+b>c&&b+c>a&&a+c>b){ System.out.println("能构成三角形"); } else{ System.out.println("不能构成三角形"); } } }
5 输入年份月份,输出该月的天数
package homework4; import java.util.Scanner; public class Text5 { /** * @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 a=input.nextInt(); System.out.println("输入月份"); int b=input.nextInt(); if(b==1&&b==3&&b==5&&b==7&&b==8&&b==10&&b==11&&b==12) { System.out.println("该月有31天"); } else if(b==4&&b==6&&b==8&&b==10) { System.out.println("该月有30天"); } else if(a%4==0&&a%100==0||a%400==0) { System.out.println("该月有29天"); } else{ System.out.println("该月有28天"); } } }
6.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 Text6 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入成绩"); int chengJi=input.nextInt(); switch(chengJi/10){ case 10: case 9: System.out.println("等级为A"); break; case 8: System.out.println("成绩为B"); break; case 7: System.out.println("成绩为C"); break; case 6: System.out.println("成绩为D"); break; default: System.out.println("成绩为F"); break; } } }
7.输入一个数字,判断是一个奇数还是偶数
package homework4; import java.util.Scanner; public class Text7 { /** * @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(); switch(a%2){ case 0: System.out.println("该数为偶数"); break; default: System.out.println("该数为奇数"); break; } } }
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 Text8 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入变量x"); 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"); break; } } }
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 Text9 { /** * @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%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%5!=0&&a%6==0){ System.out.println("能被6整除"); } else{ System.out.println("不能被5或6整除"); } } }