---
tags: 30 天軟體工程師體驗營｜2025
---
> 建議觀看的影音章節：
> JS - 變數：布林、undefined、null

# 🏅 JS 任務 Day2 - 數字處理

## 提示
1. [JavaScript 數字方法](https://www.w3school.com.cn/js/js_number_methods.asp)

---
### 題目一：平方計算

// input 輸入
square(3)
square(9)
square(20)
// output 輸出
9
81
400

### 題目二：數學邏輯題

// input 輸入
calculate(5,7,3)
calculate(9,8,7)
calculate(5,2,0)
calculate(9,9,33)

// output 輸出
9
10
7
-15

### 題目三：四捨五入題

// input 輸入
rounding(3.9988)
rounding(3984.222)
rounding(77.777)

// output 輸出
4.00
3984.22
77.78

### 題目四：字串轉數字

// input 輸入
parseNumber("2.33")
parseNumber("Hello!!")
parseNumber("30000")

// output 輸出
2.33
NaN
30000

### 題目五：被二整除
:::spoiler #### 提示
可以用 % 取餘數
:::

// input 輸入
divisible(2)
divisible(3)
divisible(77)
divisible(88)

// output 輸出
0
1
1
0

---

## 回報流程

1. 將答案貼在 Codepen 並複製 Codepen 連結貼至「回報區」回報
（也可以將答案直接貼至「回報區」）


<!-- 解答：
題目一：
function square(num) {
console.log(num * num);
}

題目二：
function calculate(a, b, c) {
console.log(a + b - c);
}

題目三：
function rounding(num) {
console.log(parseFloat(num.toFixed(2)));
}

題目四：
function parseNumber(str) {
console.log(parseFloat(str));
}

題目五：
function divisible(num) {
console.log(num % 2 === 0 ? 0 : 1);
}
-->

回報區
---

| 報數 | Discord 名字 | Codepen／其他回饋 |
|:----:|:------------:|:-----------------------------------------------------------------------------:|
| 1 | Saika | [Codepen](https://codepen.io/saika4501/pen/qEEPKeE?editors=0011 ) |
| 2 | RUDY | [Codepen](https://codepen.io/Rudy-crw/pen/NPPaBwL?editors=0010) |
|3|小趴|[Codepen](https://codepen.io/papa2415/pen/wvZOewZ)|
| 4 | 4chan | [Codepen](https://codepen.io/ijuolaqc-the-looper/pen/MYgNKYQ?editors=1011) |
| 5 | 7Lun | [Day2-Codepen](https://codepen.io/mfyvqhsn-the-bold/pen/LEEzBdb?editors=0012) |
| 6 | 力文 | [Codepen](https://codepen.io/liwenchiou/pen/jEEGvNg?editors=0011) |
|7|蛋殼|[Codepen](https://codepen.io/weybrian/pen/KwwXBEj)
| 8 | WAWATA | [Codepen](https://codepen.io/wa-wa-GNOHC-WA-Wa/pen/yyyzxKa) |
| 9 | B | [Codepen](https://codepen.io/Babel777/pen/MYYEBNY) |
| 10 | Toung | [Codepen](https://codepen.io/Toung/pen/RNNLYyv)
| 11 | mambo | [Codepen](https://codepen.io/chiang_mb/pen/NPPaObd)
| 12 | 馬德 | [Codepen](https://codepen.io/maywang/pen/ByywOpE?editors=0012)
| 13 | jingle0900 | [Codepen](https://codepen.io/EvaLi0472/pen/pvvWZOX?editors=1111)
| 14 | 里歐 | [Codepen](https://codepen.io/akihico/pen/emmGQVO?editors=1010)
| 15 | 叮咚 | [Codepen](https://codepen.io/pen/?editors=1111)
| 16 | pastor | [Codepen](https://codepen.io/peter_hung/pen/EaawdoG)
| 17 | 新月 | [Codepen](https://codepen.io/gffaufsy-the-bashful/pen/oggGJKQ)
| 18 | HLC | [Codepen](https://codepen.io/pppbbb262626/pen/vEEebKo?editors=1111)
| 19 | Kath | [Codepen](https://codepen.io/JLin-the-lessful/pen/XJJeGJQ?editors=1111) |
| 20 | dean | [Codepen](https://codepen.io/ch933114/pen/gbbGJZL?editors=1111) |
| 21 | 阿香 Mia | [Codepen](https://codepen.io/li-shiang-yu/pen/wBBPvem?editors=1112) |
| 22 | nora_zizi | [Codepen](https://codepen.io/Nora-Ch/pen/PwwOwod?editors=1111)
| 23 | Ali | [Codepen](https://codepen.io/Alicia1117/pen/zxxPYmv) |
| 24 | CBK | [Codepen](https://codepen.io/BK-C-the-styleful/pen/oggGKQM) |
| 25 | Nora | [Codepen](https://codepen.io/Yun-Jhen-Dai/pen/PwwOqbq?editors=1011) |
| 26 | zhe | [Codepen](https://codepen.io/dotheright/pen/PwwOZLM) |
| 27 | Joseph_Kyuu | [Codepen](https://codepen.io/zrzfastd-the-reactor/pen/WbbZmPP) |
| 28 | BL | [Codepen](https://codepen.io/bonnieli1414/pen/qEEVZNQ?editors=0011) |
| 29 | ArvinSu | [Codepen](https://codepen.io/Arvin-Su/pen/PwwOGXr) |
| 30 | wei_0982 | [Codepen](https://codepen.io/nico-lai/pen/xbbPXOJ?editors=0011) |
| 31 | 蛋白 | [蛋白的Codepen Day2](https://codepen.io/sjlu-0/pen/RNNjjLp) |
| 32 | 蛋黃 | [Codepen](https://codepen.io/yiyun12o9/pen/myyqXPZ) |
| 33 | Archang | [Codepen](https://codepen.io/pxfnrvgk-the-styleful/pen/oggoEzJ) |
| 34 | DD | [Codepen](https://codepen.io/dorihung/pen/Byymrzd) |
| 35 | mercury2508. | [Codepen](https://codepen.io/Mercury2508/pen/pvvdqXb) |
| 36 | Apple Pie | [Codepen](https://codepen.io/ymevqzjf-the-builder/pen/Eaabwoe?editors=0111) |
| 37 | Cami | [CodePen](https://codepen.io/irisLife/pen/PwwEeja)|
| 38 | ann#6212 | [CodePen](https://codepen.io/yqmegupa-the-styleful/pen/gbboKRN)|
| 39 | Yukon | [CodePen](https://codepen.io/ukowork/pen/QwwaBGO)|
| 40 | yuna | [CodePen](https://codepen.io/Yuna1002/pen/EaaoGJW?editors=0112)|
| 41 | 牛奶 | [CodePen](https://codepen.io/0omilko0/pen/zxxPXBq?editors=0011)|
| 42| Hugh | [CodePen](https://codepen.io/Hugh-Chen/pen/pvvpYpK?editors=1111)|
|43|YuTing|[CodePen](https://codepen.io/venus50533/pen/YPPYbmm)|
|44|野鴿|[CodePen](https://codepen.io/HoshinoSyouta/pen/OPPzKdr?editors=1111)|
|45|Iannaan|[O(1)CodePen](https://codepen.io/ian293382/pen/XJJVQOj?editors=1111)|
|46|stone|[CodePen](https://codepen.io/bgrwlzoz-the-reactor/pen/xbbYvLw)|
| 47 | Leonard | [Codepen](https://codepen.io/hyyfjqra-the-sans/pen/QwwmwdB) |
|48| yang | [Codepen](https://codepen.io/Yang-J/pen/zxxWwvB) |
| 49 | WEIWEI | [Codepen](https://codepen.io/weiwei93/pen/raaYvqy) |
| 50 | Jessie | [Jessie 的 Codepen](https://codepen.io/bakyfkso-the-looper/pen/XJJEVVv)
| 51 | 周周 | [Codepen](https://codepen.io/jhoujhou-the-decoder/pen/KwwRpNj?editors=1012)
| 52 | tung | [Codepen](https://codepen.io/oltsegon-the-looper/pen/wBBjayO) |
| 53 | holysi | [Codepen](https://codepen.io/holysi/pen/PwweZJj) |
| 54 | Rogan | [Codepen](https://codepen.io/RoganHsu/pen/raavzwo?editors=1111) |
| 55 | William Hsieh | [Codepen](https://codepen.io/lsaimqxa-the-vuer/pen/zxxjbjR?editors=0012) |
| 56 | Owen He | [Codepen](https://codepen.io/owen1120/pen/RNNyXja?editors=0012) |
| 57 | yue | [Codepen](https://codepen.io/Ling-the-scripter/pen/qEEKBjY) |
| 58 | Chuang | [Codepen](https://codepen.io/uidoytjq-the-solid/pen/RNNJQBx?editors=0012) |
| 59 | ninii | [Codepen](https://codepen.io/niiniiii/pen/oggMvYx?editors=1111) |
| 60 | Ariel | [Codepen](https://codepen.io/ariel0510/pen/vEEzKpR?editors=0011) |
| 61 | Sonia | [Codepen](https://codepen.io/YUJOU/pen/WbbgXRP?editors=0011) |
| 62 | 姜承 | [Codepen](https://codepen.io/Troy0718/pen/VwEzaGa?editors=1010) |
| 63 | oyll | [Codepen](https://codepen.io/dizzydog-rgb/pen/gbbdzbE?editors=0011) |
| 64 | Peggy| [Codepen D1to5](https://codepen.io/cpt23462599/pen/gbbdeOo)|
| 65 | dawnwang87| [Codepen](https://codepen.io/yrpnrtsy-the-typescripter/pen/GggYmVm?editors=1111)|
| 65 | ja4071| [Codepen](https://codepen.io/SHAO-L/pen/myyaXmY)|
| 66 | Acadia | [Codepen](https://codepen.io/Acadia/pen/zxxyjrG?editors=0011) |
| 67 | vima | [Codepen](https://codepen.io/chin7004/pen/EaaGByG?editors=1111) |
| 68 | kelsonhouse | [Codepen](https://codepen.io/Kelson-House/pen/vEEbLQR?editors=1111)|
|69|JHT|[Codepen](https://codepen.io/juanht/pen/oggmLqN?editors=0012)|
| 70 | duchi | [Codepen](https://codepen.io/sqaz0502/pen/RNNdxeZ) |
| 71 | Yi-Kuei | [Codepen](https://codepen.io/Yi-Kuei-Chuang/pen/gbbEjQr?editors=1112) |
| 72 | Holly | [Codepen](https://codepen.io/LEE-HOLLY/pen/MYYReNG?editors=1111) |
|73| allen3290 |[Codepen](https://codepen.io/udadkudw-the-looper/pen/ByyEJzW?editors=1111)|
| 74 | kwk.1315 | [Codepen](https://codepen.io/K__________/pen/ByyEYge) |
| 75 | tina91211900 | [Codepen](https://codepen.io/jbmbtkqr-the-flexboxer/pen/EaazVBp?editors=1112) |
| 76 | taishan_90178 | [Codepen](https://codepen.io/candy99/pen/myyZjBG?editors=0012) |
| 77 | xiaocai_97765 | [Codepen](https://codepen.io/dupre55667788/pen/raaXpNy?editors=0010)
| 78 | Mic | [Codepen](https://codepen.io/Mic-Pan/pen/myyNQmX?editors=0012)
| 79 | melody08 | [Codepen]() |
| 80 |rinn | [Codepen](https://codepen.io/cqsioetr-the-bold/pen/qEdEoMd?editors=0111)
| 81 | 610 | [Codepen](https://codepen.io/YI-LING-LIU/pen/zxGrqdK) |
| 82 | kent_31665 | [Codepen](https://codepen.io/kentlee406/pen/wBaGGLZ?editors=0011) |
| 83 | Melanie | [Codepen](https://codepen.io/pnrcspte-the-animator/pen/XJbRqxX) |
| 84 | Astrid | [6/8](https://codepen.io/astrid321654/pen/gbpGPxL?editors=0012) |
| 85 | World | [Codepen](https://codepen.io/HexschoolVuePujols/pen/vEOjwgb) |
| 86 | andy | [Codepen](https://codepen.io/ewnblckz-the-styleful/pen/OPybWoV?editors=0011) |
| 87 | 禹成林 | [Codepen](https://codepen.io/useirin/pen/QwjmgNL) |
| 88 | haohaoliao | [playcode](https://playcode.io/2541474)|

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| 00 | user | [Codepen]() |
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