Java第二次作业
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 aaa; import java.util.Scanner; public class Taxt { 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(); boolean isRun=year%4==0&&year%100!=0||year%400==0; int day=31; switch(month) { case 4: case 6: case 9: case 11: day=30; break; case 2: if(isRun) { day=29; }else { day=28; } break; } System.out.println("该月有"+day+"天"); } }
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 aaa; import java.util.Scanner; public class Taxt { 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 a=input.nextInt(); switch(a/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; default: System.out.println("E"); } } }
3、输入一个数字,判断是一个奇数还是偶数
package aaa; import java.util.Scanner; public class Taxt { 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==1) { System.out.println("奇数"); }else { System.out.println("偶数"); } } }
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 aaa; import java.util.Scanner; public class Taxt { 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); }else if(x==5) { System.out.println(x); }else if(x==10){ System.out.println(x); }else { System.out.println("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 aaa; import java.util.Scanner; public class Taxt { 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 a,b; if(x%5==0&&x%6==0) { System.out.println("能被5和6同时整除"); }else if(x%5==0&&x%6!=0){ System.out.println("能被5整除"); }else if(x%6==0&&x%5!=0) { System.out.println("能被6整除"); }else { System.out.println("不能被5或6整除"); } } }
第六题输入一个年份,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 aaa; import java.util.Scanner; public class Taxt { 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("闰年"); else System.out.println("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 aaa; import java.util.Random; import java.util.Scanner; public class Taxt { public static void main(String[] args) { // TODO Auto-generated method stub Random r= new Random(); Scanner input = new Scanner(System.in); System.out.println("输入一个4位会员卡号"); int x=input.nextInt(); int y=r.nextInt(10); if(x/10%100==y) System.out.println("幸运会员"); else System.out.println("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 aaa; //import java.util.Random; import java.util.Scanner; public class Taxt { public static void main(String[] args) { // TODO Auto-generated method stub //Random r= new Random(); Scanner input = new Scanner(System.in); System.out.println("输入x的值"); double x=input.nextDouble(); if(x>0) System.out.println("y的值是"+(x+3)); else if(x==0) System.out.println("y的值是"+0); else System.out.println("y的值是"+(x*2-1)); } }
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 aaa; //import java.util.Random; import java.util.Scanner; public class Taxt { public static void main(String[] args) { // TODO Auto-generated method stub //Random r= new Random(); Scanner input = new Scanner(System.in); System.out.println("依次输入三条边的值"); 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("可以构成三角形"); }else { System.out.println("不能构成三角形"); } } }