3.26第四次作业
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 week05; import java.util.Scanner; public class Homework { /** * @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 week05; import java.util.Scanner; public class Homework01 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入一个成绩grade"); 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 week05; import java.util.Scanner; public class Homework02 { /** * @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 week05; import java.util.Scanner; public class Homework03 { /** * @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 week05; import java.util.Scanner; public class Homework04 { /** * @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"); } } }
6。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 week04; import java.util.Scanner; public class Homework20 { /** * @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year"); int year = input.nextInt(); if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) { System.out.println(year + "年份是闰年"); } else { System.out.println(year + "年份是平年"); } } }
7..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 week04; import java.util.Random; import java.util.Scanner; public class Homework21 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入一个四位数"); int num = input.nextInt(); int bai = num % 1000 / 100; Random r = new Random(); int n = r.nextInt(10); System.out.println("随机数n=" + n); if (bai == n) { System.out.println("卡号是幸运会员"); } else { System.out.println("卡号不是幸运会员"); } } }
8.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 week04; import java.util.Scanner; public class Homework22 { /** * @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值"); int x=input.nextInt(); int y=0; if(x<0){ y=x*2-1; }else if(x==0){ y=0; }else if(x>0){ y=x+3; } System.out.println("y="+y); } }
9.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 week04; import java.util.Scanner; public class Homework23 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入三角形的一条边a"); double a = input.nextDouble(); System.out.println("输入三角形的一条边b"); double b = input.nextDouble(); System.out.println("输入三角形的一条边c"); double c = input.nextDouble(); if (a + b > c && a + c > b && b + c > a) { System.out.println("三角形的三条边能构成三角形"); } else { System.out.println("三角形的三条边不能构成三角形"); } } }