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 chap3;

import java.util.Scanner;

public class text1 {

    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();
        if (year % 4 == 0 && year%100!=100 || year % 400 == 0) {
            System.out.println("该年份为闰年");
        } else {
            System.out.println("该年份是平年");
        }
    }

}

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 chap3;

import java.util.Random;
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("输入一个四位卡号");
        int card = input.nextInt();
        Random r = new Random();
        int a = r.nextInt(10);
        System.out.println("输出随机数" + a);
        if (card / 100 % 10 == a) {
            System.out.println("该用户为幸运会员");
        } else {
            System.out.println("该用户不是幸会会员");
        }
    }

}

 

3.已知函数,输入x的值,输出对应的y的值.

 

package chap3;

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("输入一个值x");
        int x = input.nextInt();
        int y1 = x + 3;
        int y2 = 0;
        int y3 = x * 2 - 1;
        if (x > 0) {
            System.out.println("y的值为" + y1);
        } else if (x == 0) {
            System.out.println("y的值为" + y2);
        } else if (x < 0) {
            System.out.println("y的值为" + y3);
        }
    }

}

 

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 chap3;

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("请输入三个数");
        int a = input.nextInt();
        int b = input.nextInt();
        int c = input.nextInt();
        if (a + b > c && b + c > a && a + c > b) {
            System.out.println("可以构成三角形");
        } else {
            System.out.println("不能构成三角形");
        }
    }

}

 

作业

5.输入年份月份,输出该月的天数(闰年229天,条件参考上机练习1

package chap3;

import java.util.Scanner;

public class text5 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("输入年份及其月份");
        int year = input.nextInt();
        int month = input.nextInt();
        if (year % 4 == 0 && year%100!=100 || year % 400 == 0) {
            switch(month){
            case 2:
                System.out.println("该月天数为"+29);
                break;
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
                System.out.println("该月天数为"+31);
                break;
                default:
                    System.out.println("该月天数为"+30);
                    break;
            }
        } else {
           switch(month){
           case 2:
                System.out.println("该月天数为"+28);
                break;
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
                System.out.println("该月天数为"+31);
                break;
                default:
                    System.out.println("该月天数为"+30);
                    break;
           }
        }
    }

}

6、给定一个成绩a,使用switch结构求出a的等级

A90-100B80-89C70-79D60-69E0~59

 

package chap3;

import java.util.Scanner;

public class text6 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入成绩");
        int a = input.nextInt();

        switch (a / 10) {
        case 9:
            System.out.println("成绩为A");
            break;
        case 8:
            System.out.println("成绩为B");
            break;
        case 7:
            System.out.println("成绩为C");
            break;
        case 6:
            System.out.println("成绩为D");
            break;
        default:
            System.out.println("成绩为E");
            break;
        }
    }

}

 

7、输入一个数字,判断是一个奇数还是偶数 

 

package chap3;

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("请输入一个数");
        int a = input.nextInt();
        if (a % 2 == 0) {
            System.out.println("该数为偶数");
        } else {
            System.out.println("该数为奇数");
        }
    }

}

 

8、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 chap3;

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("请输入一个数");
        int a = input.nextInt();
        switch (a) {
        case 1:
            System.out.println("1");
            break;
        case 5:
            System.out.println("5");
            break;
        case 10:
            System.out.println("10");
            break;
        default:
            System.out.println("none");
            break;
        }
    }

}

 

9、判断一个数字是否能被56同时整除(打印能被56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56整除,(打印不能被56整除)

 

package chap3;

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("输入一个数");
        int a = input.nextInt();
        if (a % 5 == 0 && a % 6 == 0) {
            System.out.println("这个数可以被5和6整除");
        } else if (a % 5 == 0) {
            System.out.println("这个数只能被5整除");
        } else if (a % 6 == 0) {
            System.out.println("这个数只能被6整除");
        } else if (a % 5 == 0 || a % 6 == 0) {
            System.out.println("这个数不能被5或6整除");
        }

    }

}

 

 

posted @ 2021-03-26 19:26  计算机1901金皓楠  阅读(52)  评论(0编辑  收藏  举报