 //while
 int b = 1;
 int sum =0;
 while (b <= 100) {  
     sum+= b;
     b++;
 }
     System.out.println(sum);
     
 //for
for(int a= 1,sum=0;a<=100;sum += a,a++) {
    System.out.println(sum);
}

老师，请问这样对while向for的转化是正确的吗，输出的结果差距很大。while只会输出一个sum值，但for会把每一步加的都输出出来。

JAVA 全系列/第一阶段：AI驱动的JAVA编程/控制语句、方法、递归算法 22156楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <from action="">
        <table border="1" width="600" >
<!--            用户名-->
            <tr >
                <td align="right">用户名：</td>
                <td align="center">
                    <input type="text">
                </td>
            </tr>
<!--            密码-->
            <tr bgcolor="#a9a9a9">
                <td align="right" >密码：</td>
                <td align="center">
                    <input type="password">
                </td>
            </tr>
            <tr>
<!--                性别-->
                <td align="right">性别：</td>
                <td align="center">
                    <input type="radio" value="man" name="man" id="man" checked>
                    <label for="man">男</label>
                    <input type="radio" value="woman" name="woman" id="woman" >
                    <label for="woman">女</label>
                </td>
            </tr>
        </table>
    </from>
</body>
</html>

WEB前端全系列/第一阶段：HTML5+CSS3模块/表单 22157楼

大家快用ieda 连接数据库吧比这个好操作多啦这上面错误太难找了

JAVA 全系列/第四阶段：数据库与AI协同技术实战/SQL 语言 22158楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<table border="1" bordercolor="red" width="700" >
    <tr align="center" bgcolor="orange">
        <td>片名</td>
        <td>日期</td>
        <td>时间</td>
        <td>电影院</td>
        <td>票价</td>
    </tr>
    <tr align="center">
        <td rowspan="2">【国】卡拉是条狗</td>
        <td rowspan="3">3月7日</td>
        <td rowspan="6">7：30</td>
        <td rowspan="2">红楼电影院</td>
        <td>小厅：40</td>
    </tr>
    <tr align="center">
        <td>大厅：50</td>
    </tr>
    <tr align="center">
        <td>【美】谍海计中计</td>
        <td>花市电影院</td>
        <td>30</td>
    </tr>
    <tr align="center">
        <td>【美】正义守望者</td>
        <td>3月8日</td>
        <td rowspan="3">华星国际影院</td>
        <td>小厅：35</td>
    </tr>
    <tr align="center">
        <td>【国】周渔的火车</td>
        <td>3月10日</td>
        <td>大厅：50</td>

    </tr>
    <tr align="center">
        <td>【美】冰川时代</td>
        <td>3月11日</td>
        <td>情侣座：80</td>
    </tr>
</table>
</body>
</html>

WEB前端全系列/第一阶段：HTML5+CSS3模块/HTML5基础元素 22159楼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <table border="1" width="500"  align="center" bgcolor="#a9a9a9" bordercolor="white">
        <tr>
            <th colspan="3">学习成绩</th>
        </tr>
        <tr align="center">
            <td rowspan="2">张三</td>
            <td>语文</td>
            <td>98</td>
        </tr>
        <tr align="center">
            <td>数学</td>
            <td>95</td>

        </tr>
        <tr align="center">
            <td rowspan="2">李四</td>
            <td>语文</td>
            <td>88</td>
        </tr>
        <tr align="center">
            <td>数学</td>
            <td>91</td>
        </tr>
    </table>
</body>
</html>

WEB前端全系列/第一阶段：HTML5+CSS3模块/HTML5基础元素 22160楼

pygame
SCREEN_WIDTH=SCREEN_HIGHT=BG_COLOR=pygame.Color()
MainGame():
    window=():
        ():
        pygame.display.init()
        MainGame.widow=pygame.display.set_mode([SCREEN_WIDTHSCREEN_HIGHT])
        pygame.display.set_caption()
        :
            MainGame.window.fill(BG_COLOR)
            pygame.display.update()
    ():
        Tank():
    ():
        ():
        ():
        ():
        MyTank():
    ():
        EnemyTank(Tank):
    ():
        ().()
Bullet():
    ():
        ():
        ():
        Wall():
    ():
        ():
        Explode():
    ():
        ():
        Music():
    ():
        ():
        __name__==:
    MainGame().startGame()

C:\Users\86137\PycharmProjects\mypro01\venv\Scripts\python.exe C:/Users/86137/PycharmProjects/mypro01/tanke01.py

pygame 2.0.1 (SDL 2.0.14, Python 3.9.2)

Hello from the pygame community. https://www.pygame.org/contribute.html

Traceback (most recent call last):

File "C:\Users\86137\PycharmProjects\mypro01\tanke01.py", line 101, in <module>

MainGame().startGame()

File "C:\Users\86137\PycharmProjects\mypro01\tanke01.py", line 48, in startGame

MainGame.window.fill(BG_COLOR)

AttributeError: 'NoneType' object has no attribute 'fill'

Process finished with exit code 1

运行的时候为什么是fill错误呀、、、

Python 全系列/第二阶段：Python 深入与提高/游戏开发-坦克大战 22161楼