变量和数据类型java练习

1.

①

package com.company;

public class HomeWork8_19 {
    public static void main(String[] args) {
        String name = "小明";
        int age = 25;
        int seniority = 3;
        int age1 = 5;
        String subject = "java";
        String hobby = "篮球";
        System.out.println("这个同学的姓名是：" + name);
        System.out.println("年龄是：" + age);
        System.out.println("工作了" + seniority + "年");
        System.out.println("做过" + age1 + "个项目");
        System.out.println("技术方向是" + subject);
        System.out.println("兴趣爱好是：" + hobby);
    }
}

②

package com.company;
import java.util.Scanner;
public class HomeWork8_19 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入4位会员卡号：");
        int card = scanner.nextInt();
        System.out.print("会员卡号是：" + card);
        scanner.close();
    }
}

③

package com.company;
import java.util.Scanner;
public class HomeWork8_19 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入一个四位卡号:");
        Integer idCard = scanner.nextInt();
        int ge,shi,bai,qian,sum;
        ge = idCard % 10;
        shi = idCard / 10 % 10;
        bai = idCard /100 % 10;
        qian = idCard / 1000;
        sum = ge+shi+bai+qian;
        System.out.println("个位数为："+ge);
        System.out.println("十位数为："+shi);
        System.out.println("百位数为："+bai);
        System.out.println("千位数为："+qian);
        System.out.println("各位数字的和为："+sum);
        scanner.close();

    }
}

④

package com.company;
import java.util.Scanner;
public class HomeWork8_19 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入一个四位卡号:");
        Integer idCard = scanner.nextInt();
        int ge,shi,bai,qian,sum;
        ge = idCard % 10;
        shi = idCard / 10 % 10;
        bai = idCard /100 % 10;
        qian = idCard / 1000;
        sum = ge+shi+bai+qian;
        System.out.println("个位数为："+ge);
        System.out.println("十位数为："+shi);
        System.out.println("百位数为："+bai);
        System.out.println("千位数为："+qian);
        System.out.println("各位数字的和为："+sum);
        System.out.println(sum > 20 ? "中奖了" : "没中奖");
        scanner.close();

    }
}

2、编程实现自我介绍，通过键盘输入姓名[name]，年龄[age]，工作年限[years]，技术方向[skill]，兴趣爱好[hobby]。

package com.company;
import java.util.Scanner;
public class HomeWork8_19 {
    public static void main(String[] args) {
          Scanner scanner = new Scanner(System.in);
           System.out.print("请输入您的姓名：");
        String name = scanner.next();
        System.out.print("请输入您的年龄： ");
        int age = scanner.nextInt();
        System.out.print("请输入工作年限：");
        int years = scanner.nextInt();
        System.out.print("请输入您的技术方向：");
        String skill = scanner.next();
        System.out.print("请输入您的兴趣爱好：");
        String hobby = scanner.next();
        System.out.println("您的姓名是："+ name  +"，年龄是："+age +"，工作年限是" + years +"，技术方向是" + skill + "，兴趣爱好是" +hobby);

        scanner.close();

    }
}

3、编程实现三个数字[a,b,c]的交换，即1，2，3交换后变成2，3，1。

package com.company;
public class HomeWork8_19 {
    public static void main(String[] args) {
        int a,b,c,d;
        a = 1;
        b = 2;
        c = 3;
        System.out.println("a的值" + a + "，b的值" + b + ",c的值" + c);
        d = a;
        a = b;
        b = c;
        c = d;
        System.out.println("a的值" + a + "，b的值" + b + ",c的值" + c);

    }
}

4、通过键盘输入一个整数[x]求其相反数[opposite]，平方[square]，立方[cube]。

package com.company;
import java.util.Scanner;
public class HomeWork8_19 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入一个整数：");
        int x = scanner.nextInt();
        int opposite = -x;
        int square = x * x;
        int cube = x * x * x;
        System.out.println(x + "的相反数是：" + opposite + ",平方是：" + square + ",立方是：" + cube);
        scanner.close();
    }
}

5、通过键盘输入两个整数[x,y]求它们的和[sum]、差[difference]、积[product]、商[quotient]、模[remainder]。

package com.company;
import java.util.Scanner;
public class HomeWork8_19 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入整数x，y：");
        int x = scanner.nextInt();
        int y = scanner.nextInt();
        int sum = x + y;
        int difference = x - y;
        int product = x * y;
        double quotient = (double) x / (double) y;
        int remainder = x % y;
        System.out.println(x +"和"+ y + "的和是：" + sum + ",差是：" + difference + ",积是：" + product + ",商是：" + quotient + ",模是：" + ",商是：" + quotient);
        scanner.close();
    }
}