java第四次上机练习+作业

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 First;
import java.util.Scanner;
public class F1 {

    /**
     * @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");
        int year = input.nextInt();
        if ((year%4==0&&year%100!=0)||(year%400==0)) {
            System.out.println("是闰年");
        } else {
            System.out.println("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 First;
import java.util.Random;
import java.util.Scanner;
public class F2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Random r = new Random();
        Scanner input = new Scanner(System.in);
        int m = r.nextInt(10);
        System.out.println("幸运数字是" + m);
        System.out.println("输入一个四位会员卡号");
        int n = input.nextInt();
        if (n % 1000 / 100 == m) {
            System.out.println("您是幸运会员");
        } else {
            System.out.println("您不是幸运会员");
    }

    }
}

 

 

 

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 First;
import java.util.Scanner;
public class F3 {

    /**
     * @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();
        int y;
        if (x > 0) {
            y = x + 3;
            System.out.println("y=" + y);
        } else if (x == 0) {
            System.out.println("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 First;
import java.util.Scanner;
public class F4 {

    /**
     * @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("这三个数能构成三角形");
        } else {
            System.out.println("这三个数不能构成三角形");
    }

    }
}

 

 

 

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 First;

import java.util.Scanner;

public class L1 {

    /**
     * @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();
        int day;
        switch (month) {
        case 4:
        case 6:
        case 9:
        case 11:
            System.out.println("该月有" + 30 + "天");
            break;
        default:
            System.out.println("该月有" + 31 + "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");
            }
        }
    }

}

 

 

2.给定一个成绩a,使用switch结构求出a的等级

 

package First;

import java.util.Scanner;

public class L2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入成绩");
        int g = input.nextInt();
        switch (g / 10) {
        case 10:
        case 9:
            System.out.println("等级A");
            break;
        case 8:
            System.out.println("等级B");
            break;
        case 7:
            System.out.println("等级C");
            break;
        case 6:
            System.out.println("等级D");
            break;
        default:
            System.out.println("等级E");
            break;
        }
    }

}

 

 

 

3.输入一个数字,判断是一个奇数还是偶数

package First;

import java.util.Scanner;

public class L3 {

    /**
     * @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();
        if (a % 2 == 0) {
            System.out.println("该数是偶数");
        } else {
            System.out.println("该数是奇数");
        }
    }

}

 

 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 First;

import java.util.Scanner;

public class L4 {

    /**
     * @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 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 First;

import java.util.Scanner;

public class L5 {

    /**
     * @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 x = input.nextInt();
        if (x % 30 == 0) {
            System.out.println("能被5和6整除");
        } else if (x % 5 == 0) {
            System.out.println("能被5整除");
        } else if (x % 6 == 0) {
            System.out.println("能被6整除");
        } else if (x % 30 != 0) {

            System.out.println("不能被5或6整除");

        }
    }
}

 

 

 

 

 

 

 

 

posted @ 2021-03-26 21:18  张秋菊  阅读(116)  评论(0编辑  收藏  举报