Java第四次作业

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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) import java.util.Scanner;   public clas1 {          public static void main(String[] args) {                 int year;                 Scanner  scanner = new Scanner(System.in);                 year=scanner.nextInt();                 if(year%4==0&&year%100!=0||year%400==0){                           System.out.println(year+"是闰年");          }else{                 System.out.println(year+"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.   import java.util.Random;   import java.util.Scanner;        public clas1 {          public static void main(String[] args) {                 Scanner input = new Scanner(System.in);                 System.out.println("输入一个四位会员号");                 int a = input.nextInt();                 int b;                 b = a/100%10;                 Random r = new Random();                 int s = r.nextInt(10);                 if(b==s){                        System.out.println("是幸运会员");                 }else{                        System.out.println("是普通会员");                 }          }        }                            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 )        import java.util.Scanner;   public clas1 {          public static void main(String[] args) {                 Scanner s = new Scanner(System.in);                 int x = s.nextInt();                 int y;                 if(x>=0){                        if(x==0){                               y=0;                        }else{                               y = x+3;                        }                 }else{                        y = x*2-1;                 }                 System.out.println(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)   import java.util.Scanner;        public clas1 {          public static void main(String[] args) {                 Scanner s = new Scanner(System.in);                 int a,b,c;                 a = s.nextInt();                 b = s.nextInt();                 c = s.nextInt();                 if(a+c>b){                        if(a+b>c){                               if(b+c>a){                                      System.out.println("可以");                               }else{                                      System.out.println("不可以");                               }                        }else{                                      System.out.println("不可以");                                                          }                        }else{                               System.out.println("不可以");                 }          }        }                               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）   import java.util.Scanner;        public clas1 {          public static void main(String[] args) {                 Scanner s = new Scanner(System.in);                 System.out.println("输入年月");                 int year = s.nextInt();                 int month = s.nextInt();                 int day = 0;                 switch(month){                 case 1:day=31;break;                 case 2:day=28;break;                 case 3:day=31;break;                 case 4:day=30;break;                 case 5:day=31;break;                 case 6:day=30;break;                 case 7:day=31;break;                 case 8:day=31;break;                 case 9:day=30;break;                 case 10:day=31;break;                 case 11:day=30;break;                 case 12:day=31;break;                 };                 if(year%4==0&&year%100==0||year%400==0){                        if(month==2){                               day=29;                        }                 }                 System.out.println(day);          }        }                          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   import java.util.Random;   import java.util.Scanner;        public clas1 {                 public static void main(String[] args) {                               // TODO Auto-generated method stub                               Scanner s = new Scanner(System.in);           System.out.print("输入成绩: ");           int a = s.nextInt();           switch(a/10){               case 10:               case 9:                   System.out.println("成绩等级:A");                   break;               case 8:                   System.out.println("成绩等级:B");                   break;               case 7:                   System.out.println("成绩等级:C");                   break;               case 6:                   System.out.println("成绩等级:D");                   break;               default:                   System.out.println("成绩等级:E");           }                 }        }                        3、输入一个数字，判断是一个奇数还是偶数   package lss;        import java.util.Random;   import java.util.Scanner;        public clas1 {                 public static void main(String[] args) {                               // TODO Auto-generated method stub                               System.out.print("输入数字");           Scanner s = new Scanner(System.in);           int a = s.nextInt();           if(a % 2 == 0){               System.out.println("偶数");           }else{               System.out.println("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。、   import java.util.Random;   import java.util.Scanner;        public clas1 {                 public static void main(String[] args) {                                Scanner input=new Scanner(System.in);                         System.out.println("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");                           }                 }        }                               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）   import java.util.Random;   import java.util.Scanner;        public clas1 {                 public static void main(String[] args) {                               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 if(a%5!=0&&a%6!=0)               System.out.println("不能被5或6整除");                 }        }