Java第四周上机练习加作业
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 homewok; 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("输入年份"); int year = input.nextInt(); System.out.println("输入月份"); int month = input.nextInt(); switch (month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: System.out.println("该月份31天"); break; case 4: case 6: case 9: case 11: System.out.println("该月份30天"); break; case 2: if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) { System.out.println("闰年二月29天"); } else { System.out.println("平年二月28天"); } break; default: System.out.println("输入的月份无效"); } } }
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 homewok; 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("输入成绩:"); int grade = input.nextInt(); switch (grade / 10) { case 10: 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; case 5: case 4: case 3: case 2: case 1: case 0: System.out.println("E"); break; default: System.out.println("输入的成绩无效"); } } }
3.输入一个数字,判断是一个奇数还是偶数。
package homewok; 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("输入一个数num"); int num=input.nextInt(); if(num%2==0){ System.out.println(num+"是偶数"); }else{ System.out.println(num+"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 homewok; 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x"); 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 homewok; 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("输入一个数"); int num = input.nextInt(); if (num % 5 == 0 && num % 6 == 0) { System.out.println(num + "能被5和6整除"); } else if (num % 5 == 0) { System.out.println(num + "能被5整除"); } else if (num % 6 == 0) { System.out.println(num + "能被6整除"); } else if (num % 5 != 0 && num % 6 != 0) { System.out.println(num + "不能被5或6整除"); } } }
上机练习题
1.输入一个年份,判断是不是闰年(能被4整除但不能被一百整除,或者能被400整除)
package Homework; 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("请输入一个年份"); int m=input.nextInt(); if(m%4==0&&m%100!=0||m%400==0) { System.out.println("该年份是闰年"); } else { System.out.println("该年份不是闰年"); } } }
2.输入一个4位会员卡号,如果百位是随机数,就输出是幸运会员,否则就输出不是
package Homework; import java.util.Random; import java.util.Scanner; public class Test2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Random a=new Random(); Scanner input=new Scanner(System.in); int b=a.nextInt(10); System.out.println("幸运数字是"+b); System.out.println("请输入一个四位数"); int c=input.nextInt(); if(c%1000/100==b) { System.out.println("您是幸运会员"); } else { System.out.println("您不是幸运会员"); } } }
3.已知函数,输入x的值,输出对应的y值
x+3(x>0)
y=0(x=0)
x*2-1(x<0)
package Homework; 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("输入一个数"); int x=input.nextInt(); int y; if(x>0){ y=x+3; System.out.println("y="+y); } else if(x==0){ System.out.println("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 Homework; 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("这三个数能构成三角形"); } else { System.out.println("这三个数不能构成三角形"); } } }