2021-03-18课堂笔记-优快云博客

本文链接：https://blog.youkuaiyun.com/lwz01/article/details/115467150

本文档展示了四个Java程序示例，包括计算总分、基本算术操作、筛选不被3整除的数值和求平均数。通过这些代码，读者可以理解如何使用Scanner获取用户输入并进行简单的数值操作。

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Main

package edu.xcdq;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int sum = 0; //总分
    for (int i = 1 ;i<=5 ;i++) {
        System.out.println("输入第" + i + "门课成绩");
        int fen = scanner.nextInt();
        sum+=  fen ; //  ==  sum = sum + fen
    }
    int pingjun = sum/5;
        System.out.println("平均分为:" + pingjun);
    }
}

demo01

package edu.xcdq;

import java.util.Scanner;

/**
 * @qvthor liuwenzheng
 * @date 2021/3/18 16:55
 */
public class demo01 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
//        System.out.println("请输入一个值");
//        int num= scanner.nextInt();
//        for (int i=0 , j= num ; i<=num ;i++ ,j--){
//            System.out.println(i+"+" + j + "=" +(i+j));
//        }
        System.out.println("请输入一个值");
        int sum = scanner.nextInt();

        int i = 0 ;
        for (int j=sum;i<=sum; i++,j--){



            System.out.println(i + "+" +j +" =" +sum );
        }

    }
}

demo02

package edu.xcdq;

import java.util.Scanner;

/**
 * @qvthor liuwenzheng
 * @date 2021/3/18 17:36
 */
public class demo02 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner( System.in);
          int sum = 0 ;
        for ( int i= 0 ;i <100; i++){
            if (i%3!= 0);{
                sum = sum +i ;
                System.out.println("不能被三整除的是" + i);
            }
        }
        System.out.println( "不能被3整除之和为：" +sum);
    }
}

demo03

package edu.xcdq;

import java.util.Scanner;

/**
 * @qvthor liuwenzheng
 * @date 2021/3/18 17:57
 */
public class demo03 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int score = 0;
        int sum = 0 ;
        for (int i=1 ; i<=5; i ++){
            System.out.println("请输入第" + i + "成绩");
            score = scanner.nextInt(); // 从建盘接收输入的成绩
            if (score< 0 ) {
                break;
            }
            sum = sum+score ;
        }
        System.out.println("平均数" + sum/5);
    }

}

demo04

package edu.xcdq;

import java.util.Scanner;

/**
 * @qvthor liuwenzheng
 * @date 2021/3/22 7:59
 */
public class demo04 {
    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);
    }
}