public class test1 {
	public static void main(String[]args) {
		int sum01=0;
		int sum02=0;
		int i =1;
		while( i<=100) {
			i++;
			if(i%2==0) {
				sum01+=i;
			}else {
				sum02+=i;
			}
			
		}
		System.out.println("偶数和="+sum01);
		System.out.println("奇数和="+sum02);	
	}
}

为什么运算结果是偶数=2550，奇数=2600，哪边出了问题

首先，课上最后的那个代码我没有办法成功运行，如果只select department_id能正常显示，加上last_name或者salary就会报错，具体情况跟前几楼一样

其次，视频里查询结果是错的，我研究出了下面的方法

但这样没法把department_id为空的那行显示出来，请问应该如何在这个代码的基础上加上那行数据？（或者说有什么更好的方法）

from selenium import webdriver
from time import sleep

# 构造一个浏览器
chrome = webdriver.Chrome()
url = 'https://www.huya.com/l'
chrome.get(url)
sleep(3)
temp1 = chrome.find_elements_by_class_name('nick')
temp2 = chrome.find_elements_by_class_name('js-num')
# 主播名字
names = [temp.text.strip() for temp in temp1]
# 主播人气
counts = [temp.text.strip() for temp in temp2]
temp3 = sorted(zip(names, counts), key=lambda s: s[1], reverse=True)
for name, count in temp3:
    print(name, ':', count)
chrome.quit()

老师您好，我这个代码的意思是想按主播的观看人数从大到小输出（只爬了第一页的数据），但是输出的结果却不正确，我不知道哪写错了

大家注意这个b64_code，人人车好像每隔一段时间会换一下这个b64_code，然后根据下面这个代码就可以获得车辆价格了

import base64
from fontTools.ttLib import TTFont


def create_ttf():
    b64_code = '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'

    with open('./font.ttf','wb') as f:
        f.write(base64.decodebytes(b64_code.encode()))

def decode_ttf(ttf_path):
    ttf = TTFont(ttf_path)
   # 输出数字与uni编码之间的关系 元素下标就是数字，元素内容是uni编码
    li = ttf.getGlyphOrder()[1:]
    # 输出uni编码与数字之间的关系，输出类型为字典，特殊字符的acill值:uni编码
    dic = ttf.getBestCmap()

    new_dict = {}
    for k, v in dic.items():
        # chr(k) 转成特殊字符   li.index(v) 找到uni编码所对应的下标(即对应数字)
        new_dict[chr(k)] = li.index(v)
    return new_dict
 
if __name__ == '__main__':
    # 生成ttf文件
    create_ttf()
    # 进行内容解析测试
    ttf_path = './font.ttf'  # 人人车加密价格的TTF字体文件路径
    encrypted_text = '+¥.起'  # 需要解密的加密文本
    decrypted_text = decode_ttf(ttf_path)
    # 输出：人人车价格解密结果
    ans = ''
    for char in encrypted_text:
        if char == '.':
            ans += '.'
        else:
            ans += str(decrypted_text[char])
    print(ans)

当我们调用vector的无参构造方法的时候，他调用了本类的有参构造方法

这句话，怎么理解

d = {"name":"gaoqi","age":18,"job":"student"}

for x in d.keys():
    print(d)


for x in d.values():
    print(d)


for x in d.items():
    print(d)

老师为什么我这个打码打印出来都是一样的都是keys

一、程序

二、运行结果

三、问题

1、为什么不能二进制不能添加编码参数？

老师，我输出图片成功，可是图片只有1kb怎么回事

老师，MySQL安装版和zip版有什么不同，两个安装出来是功能一样的软件吗，是不是只需要安装一个就够了？

老师，我的安装模块一直提示这个是怎么回事

怎么把swagger-ui的注释信息，导出成pdf文档？

老师，为什么我在div标签中添加了内容后，这个标签表示的地方上方出现了一片空白的地方呢？

下面是我的代码和实现的效果。

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		
		<style>
			.top{
				height:100px;
				width:100%;
				/*背景颜色*/
				background-color: azure;
				
			}
			
			.tips{
				width: 100%;
				height: 30px;
				/*背景颜色*/
				background-color: antiquewhite;
			}
			
			.center{
				
				width: 100%;
				height: 800px;
				
				/*背景颜色*/
				background-color: salmon;
				
			}
			
			.bottom{
				
				width: 100%;
				height: 100px;
				
				background-color: aliceblue;
			}
			
			.login{
				
				width: 350px;
				
				height: 500px;
				
				background-color: #ffffff;
				
				/*相对定位*/
				position: relative;
				left: 1500px;
				
				top: 10px;
				
			}
			
		</style>
		
	</head>
	<body>
		
		<!--头部模块-->
		<div class="top">
			<h1 align="center">我是顶部模块</h1>
			
		</div>
		<!--中间提示部分-->
		<div class="tips">
			<h5 align="center">###这里是广告和警告部分，请关注</h5>
			
		</div>
		
		<!--中间的展示模块-->
		<div class="center">
			<h2>这个部分展示图片等信息</h2>
			<div class="login">
				<h3>这个地方是登陆扫码窗口</h3>
				
			</div>
			
			
		</div>
		
		<!--底部模块-->
		<div class="bottom">
			
			<h2 align="center">这里是联系我们</h2>
			
		</div>
		
	</body>
</html>

<!--
	
	div标签本身是没有任何含义的
	
	div：作用就是把网页进行模块化的划分
	
-->

老师，视频中创建的XML直接到了JRE下，而我创建的XML自动到src怎么办？

老师我防火墙已经禁用了 启动nginx怎么还是失败呢？

视屏最后确实 讲错了，既然已经有同学提出来了，请及时更正，不然有的同学没发现，就一直错下去