Java1.3

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案例：减肥计划

import java.util.Scanner;
public class Test2 {
    public static void main (String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入:");
        int week = sc.nextInt();
        switch (week) {
            case 1:
                System.out.println("跑步");
                break;
            case 2:
                System.out.println("游泳");
                break;
            case 3:
                System.out.println("慢走");
                break;
            case 4:
                System.out.println("动感单车");
                break;
            case 5:
                System.out.println("拳击");
                break;
            case 6:
                System.out.println("爬山");
                break;
            case 7:
                System.out.println("好好吃一顿");
                break;
            default:
                System.out.println("您的输入有误");
                break;
        }
    }
}

1-100之间偶数和

public class Test2 {
    public static void main (String[] args) {
        int sum = 0;
        for (int i = 1;i <= 100;i++) {
            if(i % 2 == 0){
                sum += i;
            }
        }
        System.out.println("1-100之间的偶数只和为"+sum);
    }
}

逢7过

public class Test2 {
    public static void main (String[] args) {
        for (int i = 1;i <= 100;i++){
            int ge = i % 10;
            int shi = i / 10 % 10;
            if(ge == 7 || shi == 7 || i % 7 == 0){
                System.out.println(i);
            }
        }
    }
}

水仙花数

public class Test2 {
    public static void main (String[] args) {
        for (int i = 100;i <= 999;i++){
            int ge = i % 10;
            int shi = i / 10 % 10;
            int bai = i /10 /10 % 10;
            if( ge*ge*ge + shi*shi*shi + bai*bai*bai == i ){
                System.out.println(i);
            }
        }
    }
}

每行打印两个水仙花数

public class Test2 {
    public static void main (String[] args) {
        int count = 0;
        for (int i = 100;i <= 999;i++){
            int ge = i % 10;
            int shi = i / 10 % 10;
            int bai = i /10 /10 % 10;
            if( ge*ge*ge + shi*shi*shi + bai*bai*bai == i ){
                System.out.print(i + " ");
                count++;
                if(count % 2 == 0){
                  System.out.println();
                }
            }
        }
    }
}

珠穆朗玛峰

public class Test2 {
    public static void main (String[] args) {
      int count = 0;
      double paper = 0.1;
      int zf = 8844430;
      while(paper < zf){
        paper *= 2;
        count++;
      }
      System.out.println(count);
    }
}

减肥计划改进版

import java.util.Scanner;
public class Test2 {
    public static void main (String[] args) {
        lo :while(true){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入:");
        int week = sc.nextInt();
        switch (week) {
            case 0:
                break lo;
            case 1:
                System.out.println("跑步");
                break;
            case 2:
                System.out.println("游泳");
                break;
            case 3:
                System.out.println("慢走");
                break;
            case 4:
                System.out.println("动感单车");
                break;
            case 5:
                System.out.println("拳击");
                break;
            case 6:
                System.out.println("爬山");
                break;
            case 7:
                System.out.println("好好吃一顿");
                break;
            default:
                System.out.println("您的输入有误");
                break;
            }
        }
    }
}

猜数字

import java.util.Random;
import java.util.Scanner;
public class Test2 {
    public static void main(String[] args) {
        Random r = new Random();
        Scanner sc = new Scanner(System.in);
        int randomNum = r.nextInt(100) + 1;
        while (true) {
            System.out.println("请输入您要猜的数据：");
            int num = sc.nextInt();
            if (num > randomNum) {
                System.out.println("您猜大啦");
            } else if (num < randomNum) {
                System.out.println("您猜小啦");
            } else {
                System.out.println("恭喜您，猜中啦");
                break;
            }
        }
    }
}

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