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 exe2;
import java.util.Scanner;
public class text6 {

    public text6() {
        // TODO Auto-generated constructor stub
    }

    public static void main(String[] args) {
        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("这是闰年");
        }else {
            System.out.println("这不是闰年");
        }

    }

}

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.

package exe2;

import java.util.Random;
import java.util.Scanner;

public class text7 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("输入四个数字");
        int number = input.nextInt();
        int baiwei = number/100%10;
        Random r = new Random();
        int a=r.nextInt(10);
        if (baiwei==a) {
            System.out.println("您是幸运会员");
        }else {
            System.out.println("不是");
        }
    }

}

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 exe2;

import java.util.Scanner;

public class text8 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("请输入x的值");
        int x= input.nextInt();
        int y=0;
        if (x>0) {
            y=x+3;
        }else if (x==3) {
            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 exe2;

import java.util.Scanner;

public class text9 {

    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("可以成为三角形");
        }else {
            System.out.println("不能");
        }
    }

}

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 exe2;

import java.util.Scanner;

public class text {

    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 4:
        case 6:
        case 9:
        case 11:
            System.out.println("该月有30天");
            break;
        case 2:
            if (year%4==0&&year%100!=0||year%400==0) {
                System.out.println("该月有29天");
            }else {
                System.out.println("该月有28天");
            }
            break;
            default:
                System.out.println("该月有31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 exe2;
import java.util.Scanner;
public class text2 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("给定一个值");
        int a=input.nextInt();
        switch (a/10) {
        case 10:
            System.out.println("A");
        case 9:
            System.out.println("A");
        case 8:
            System.out.println("B");
        case 7:
            System.out.println("C");
        case 6:
            System.out.println("D");
            default:
                System.out.println("E");
        }
    }

}

3、输入一个数字,判断是一个奇数还是偶数

package exe2;

import java.util.Scanner;

public class text3 {

    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 == 0) {
            System.out.println("这是偶数");
        } else {
            System.out.println("这是奇数");
        }

    }

}

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 exe2;

import java.util.Scanner;

public class text4 {

    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();
        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");
        }

    }

}

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 exe2;

import java.util.Scanner;

public class text5 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("输入一个数字");
        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) {
            System.out.println("能被5整除");
        } else if (a % 6 == 0) {
            System.out.println("能被6整除");
        } else {
            System.out.println("不能被5或6整除");
        }

    }

    // TODO Auto-generated method stub

}

posted @ 2021-03-27 22:16  王城凯  阅读(34)  评论(1编辑  收藏  举报