Java第四次上机作业

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)

import java.util.Scanner;

public class home1 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("请输入一个年份");
        int year = input.nextInt();
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
            System.out.println("是闰年");
        } else {
            System.out.println("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.

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

public class home2 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("请输入一个四位卡号");
        int a = input.nextInt();
        Random r = new Random();
        int b = r.nextInt(10);
        System.out.println("随机数是" + b);
        if (a / 100 % 10==b) {
            System.out.println("该用户是幸运会员");
        } else {
            System.out.println("该用户不是幸运会员");
        }
    }

}

 

 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 )

import java.util.Scanner;

public class home3 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int y = 0;
        System.out.println("请输入x的数值");
        int x = input.nextInt();
        if (x > 0) {
            y = x + 3;
        } else if (x == 0) {
            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)

import java.util.Scanner;

public class home4 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("请输入三边");
        int x = input.nextInt();
        int y = input.nextInt();
        int z = input.nextInt();
        if (x + y > z && x + z > y && y + z > x) {
            System.out.println("可以构成三角形");
        } else {
            System.out.println("不可以构成三角形");
        }

    }
}

 

 

 

 

 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)

import java.util.Scanner;

public class test1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入年月份");
        int year = input.nextInt();
        int month = input.nextInt();
        if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
            System.out.println("该月有31天");
        } else if (month == 4 || month == 6 || month == 9 || month == 11) {
            System.out.println("该月有30天");
        } else 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
。A:90-100,B:80-89,C:70-79,D:60-69,E:0~59

import java.util.Scanner;

public class test2 {

    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:
        case 10:
            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;
        default:
            System.out.println("E");
            break;
        }
    }

}

 

 3、输入一个数字,判断是一个奇数还是偶数

import java.util.Scanner;

public class test3 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入一个数字");
        int a = input.nextInt();
        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。

import java.util.Scanner;

public class test4 {

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

import java.util.Scanner;

public class test5 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入数字");
        int a = input.nextInt();
        if (a % 5 == 0 && a % 6 == 0) {
            System.out.println("能被5和6同时整除");
        } 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 if (a % 5 != 0 || a % 6 != 0) {
            System.out.println("不能被5或6整除");
        } else {
            System.out.println("error");
        }
    }

}

 

posted @ 2021-03-27 10:17  热血青年小刘  阅读(53)  评论(0编辑  收藏  举报