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");
        }
    }

}

posted @ 2021-03-26 12:30  计算机1903刘瑞鹏  阅读(98)  评论(0编辑  收藏  举报