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 test;

import java.util.Scanner;

public class Test1 {

    /**
     * @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("输入的年份是闰年");
        } else {
            System.out.println("输入的年份不是闰年");
        }

    }

}

  

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 test;

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

public class Test2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Random r = new Random();
        System.out.println("请输入四位会员数");
        int result = r.nextInt();
        Scanner input = new Scanner(System.in);
        int vip = input.nextInt();
        if (vip / 100 % 10 == result) {
            System.out.println("您是幸运会员");

        } else {
            System.out.println("您不是幸运会员");
        }
        System.out.println(result);
    }

}

  

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 test;

import java.util.Scanner;

public class Test3 {

    /**
     * @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x");
        double x = input.nextDouble();
        double y;
        if (x > 0) {
            y = x + 3;
            System.out.println(y);

        } else if (x == 0) {
            y = 0;
            System.out.println(y);
        } else {
            y = x * 2 - 1;
            System.out.println(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 test;

import java.util.Scanner;

public class Test4 {

    /**
     * @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("输入的三个数能构成三角形");
        } else {
            System.out.println("输入的三个数不能构成三角形");
        }
    }

}

  

5.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 sj;
import java.util.Scanner;
public class sj3 {

    /**
     * @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 PY = input.nextInt();
        System.out.println("请输入月份");
        int month = input.nextInt();
        if(PY % 4 == 0 && PY % 100 != 0 || PY % 400 == 0){
            switch(month){
                case 1:
                case 3:
                case 5:
                case 7:
                case 8:
                case 10:
                case 12:
                    System.out.println("该月天数为31");
                    break;
                case 2:
                    System.out.println("该月天数为29");
                    break;
                case 4:
                case 6:
                case 9:
                case 11:
                    System.out.println("该月天数为30");
                    break;}
                    
            } else { 
                switch(month){
                case 1:
                case 3:
                case 5:
                case 7:
                case 8:
                case 10:
                case 12:
                    System.out.println("该月天数为31");
                    break;
                case 2:
                    System.out.println("该月天数为28");
                    break;
                case 4:
                case 6:
                case 9:
                case 11:
                    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
。A:90-100,B:80-89,C:70-79,D:60-69,E:0~59

package sj;

import java.util.Scanner;

public class SJ4 {

    /**
     * @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a");
        int a = input.nextInt();
        switch(a / 10){
        case 10:
        case 9:
            System.out.println("等级为A");
            break;
        case 8:
            System.out.println("等级为B");
            break;
        case 7:
            System.out.println("等级为C");
            break;
        case 6:
            System.out.println("等级为D");
            break;
        case 5:
        case 4:
        case 3:
        case 2:
        case 1:
            System.out.println("等级为E");
            break;
        
        }
    }

}

  

7、输入一个数字,判断是一个奇数还是偶数

package sj;

import java.util.Scanner;

public class SJ5 {

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

import java.util.Scanner;

public class SJ6 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入一个变量x的值");
        int x = input.nextInt();
        if(x == 1){
            x = 1;
            System.out.println("x = " + x);
        }else if(x == 5){
            x = 5;
            System.out.println("x = " + x);
        }else if(x == 10){
            x = 10;
            System.out.println("x = " + x);
        }else
            System.out.println("x = none");
    }

}

  

9、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 sj;

import java.util.Scanner;

public class SJ7 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.println("请输入一个整数");
        int sum = input.nextInt();
        if(sum % 5 == 0 && sum % 6 == 0){
            System.out.println("能被5和6整除");
        }else if(sum % 5 == 0 && sum % 6 != 0){
            System.out.println("只能被5整除");
        }else if(sum % 5 != 0 && sum % 6 == 0){
            System.out.println("只能被6整除");
        }else System.out.println("能不被5和6整除");
    }

}

  

posted on 2021-03-27 16:36  王运聪  阅读(38)  评论(0编辑  收藏  举报