第四周上机+作业3.26

上机练习

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 week3;

import java.util.Scanner;

public class Pra1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("请输入年份");
        int year=input.nextInt();
        if(year%4==0&&year%100!=0||year%400==0)
            System.out.println("该年为闰年");
        else
            System.out.println("该年不为闰年");
    }

}

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 week3;
import java.util.Random;
import java.util.Scanner;

public class Pra2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Random r=new Random();
        int a=r.nextInt(4);//产生一个随机数1
        Scanner input=new Scanner(System.in);
        System.out.println("请输入会员号 ");
        int b=input.nextInt();
        if(b%1000/100==a)
            System.out.println("幸运会员");
        else
            System.out.println("不是幸运会员");
    }

}

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 )

package week3;

import java.util.Scanner;

public class Pra3 {

    /**
     * @param args
     */
    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");
        double x=input.nextDouble();
        System.out.println("y的值为");
        if(x>0)
            System.out.println("y="+(x+3)); 
        else if(x==0)
                System.out.println("y="+0);
        else
                    System.out.println("y="+(x*2-1));
    }

}

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 week3;

import java.util.Scanner;

public class Pra4 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("请分别输入abc的值");
        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("能构成三角形");
        else
            System.out.println("不能构成三角形");
    }

}

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 week3;

import java.util.Scanner;

public class Work1 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("请输入年份");
        int year=input.nextInt();
        System.out.println("请输入月份");
        int month=input.nextInt();
        System.out.println("该月天数为");
        if (year%4==0&&month==2){
            System.out.println("29");
        }
        else if (year%4!=0&&month==2){
         System.out.println("28");
        }
        else if (month==1)
            System.out.println("31");
        else if (month==3)
            System.out.println("31");
        else if (month==4)
            System.out.println("30");
        else if (month==5)
            System.out.println("31");
        else if (month==6)
            System.out.println("30");
        else if (month==7)
            System.out.println("31");
        else if (month==8)
            System.out.println("31");
        else if (month==9)
            System.out.println("30");
        else if (month==10)
            System.out.println("31");
        else if (month==11)
            System.out.println("30");
        else if (month==12)
            System.out.println("31");
        
    }

}

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 week3;

import java.util.Scanner;



public class Work2 {

    /**
     * @param args
     */
    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();
        System.out.println("等级为");
        switch(a/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:
            System.out.println("E");
            break;
        case 4:
            System.out.println("E");
            break;
        case 3:
            System.out.println("E");
            break;
        case 2:
            System.out.println("E");
            break;
        case 1:
            System.out.println("E");
            break;
        case 0:
            System.out.println("E");
            break;
        }
    }

}

3、输入一个数字,判断是一个奇数还是偶数

package week3;

import java.util.Scanner;

public class Work3 {

    /**
     * @param args
     */
    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();
        System.out.println("该数为");
        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。

package week3;

import java.util.Scanner;

public class Work4 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input=new Scanner(System.in);
        System.out.println("输入数x");
        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 week3;

import java.util.Scanner;

public class Work5 {

    /**
     * @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 x=input.nextInt();
        if (x%5==0&&x%6==0)
            System.out.println("能同时被5和6整除");
        else if (x%5==0&&x%6!=0)
            System.out.println("只能被5整除");
        else if (x%5==0&&x%6!=0)
            System.out.println("只能被6整除");
        else if (x%5!=0||x%6!=0)
            System.out.println("不能被5或6整除");
            
            
    }

}

posted @ 2021-03-27 16:40  崔明月  阅读(45)  评论(0编辑  收藏  举报