2021-03-22课堂笔记

Main

package edu.xcdq;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
                int jia = 0;
                for ( int i = 1; i<=10 ;i++){
                    jia = jia +i ;
                    if (jia > 20){
                        System.out.println("得到大于20的当前数" + i);
                        break;
                    }
                }
                System.out.println(jia);
            }
        }

demo01

import java.util.Scanner;

/**
*@qvthor    liuwenzheng
*@date      2021/3/22 8:25
*/public class demo01 {
    public static void main(String[] args) {
         Scanner scanner =  new Scanner(System.in);
        System.out.println("请输入班级总人数");
        int num = scanner.nextInt();
        int count = 0 ;
        for (int i = 1 ; i <= num ; i++ ){
            System.out.println("请输入第" + i + "位学生的成绩");
            int score = scanner.nextInt();
            if (score <80){
               continue; //跳过当前循环，本轮循环后面的代码不在执行

            }
            count++;
        }
        System.out.println("80分以上的人数为" + count);


    }
}

demo02

package edu.xcdq;

/**
 * @qvthor liuwenzheng
 * @date 2021/3/22 9:06
 */
public class demo02 {
    public static void main(String[] args) {
        int sum = 0 ;
        for (int i = 2 ; i<= 10; i++){
            System.out.println("当前的i=" + i +"sum"+sum );
        }
        System.out.println(sum);
        for (int i = 1; i<=10 ;i++ ){
            if (i % 2 ==0){
                sum += i;
            }
        }
        System.out.println(sum);
    }
}

demo03

package edu.xcdq;

import java.util.Scanner;

/**
 * @qvthor liuwenzheng
 * @date 2021/3/22 9:18
 */
public class demo03 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in); //三引号原格式不变
        System.out.println("欢迎进入迷你游戏平台");
        System.out.println("请选择你喜欢的游戏");
        System.out.println("************************************************");
        System.out.println("\t\t\t1.斗地主");
        System.out.println("\t\t\t2.斗牛");
        System.out.println("\t\t\t3.泡泡龙");
        System.out.println("\t\t\t4.连连看");
        System.out.println("******************************************************");

        System.out.println("请选择，输入数字：");
       int youxi1 = scanner.nextInt();
       switch (youxi1){
           case 1:
               System.out.println("欢迎进入斗地主房间");
               break;
           case 2:
               System.out.println("欢迎进入斗牛房间");
               break;
           case 3:
               System.out.println("欢迎进入泡泡龙房间");
               break;
           case 4:
               System.out.println("欢迎进入连连看房间");
               break;
       }

    }


}

demo04

package edu.xcdq;

import java.util.Scanner;

/**
 * @qvthor liuwenzheng
 * @date 2021/3/22 9:26
 */
public class demo04 { //继上demo03
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("迷你游戏平台>游戏晋级");
        int count = 0 ;
        for (int i = 0; i < 5; i++) {
            System.out.println("你正在玩第" + (i + 1) + "局游戏，成绩为");
            int score = scanner.nextInt();
            if (score >=80){
                count ++;
            }
            System.out.println("继续玩下一句吗？(yes/no)");
            String shifou = "";
            if (i<4){
                System.out.println("继续下一句吗？(yes/no)");
                shifou = scanner.next();
            }
            if ("no".equals(shifou)) { //为了避免出现用户为空，导致程序崩溃，建议把确定的“no”写在前面
                System.out.println("不足5局，不能晋级");
                break;
            }
            if (i<4){  //已经是第4局，也就是最后一局，下局不在提示
                System.out.println("进入下一句");
            }

        }
        System.out.println("游戏结束");
        int youxi2 = count/5 ;
        if (youxi2 >= 0.8) {
            System.out.println("恭喜，通过1级");
        }else if(youxi2>=0.6) {
            System.out.println("恭喜，通过2级");
        }else {
            System.out.println("还需要加油哦");
        }
    }
}