---
tags: 公益程式體驗營 - 2022
---

# 🏅 5/4(三) 每日 JS 刷題任務 - 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： -->

回報區
---

<!-- 0. Bingbingboom（回報範例，請使用註解回報）
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<!-- 2. Wendy
答案：
Codepen：https://codepen.io/wendy03/pen/dydywxy
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Codepen：https://codepen.io/KuoMin/pen/vYdYMGM
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Codepen：https://codepen.io/bruno-yu/pen/ZErEwbq?editors=0010
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<!-- 5. Rex Chu
答案：
Codepen：https://codepen.io/rex_chu/pen/WNMvbOQ
-->

<!-- 6. Alphacostankion#8475
答案：
codepen: https://codepen.io/alphapolo/pen/eYVNmvW
-->

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答案：
codepen: https://codepen.io/ss97202tw/pen/rNJVaGz?editors=0011
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答案：
codepen: https://codepen.io/hiphop825/pen/KKQpwoN?editors=0010
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答案 CodePen：
https://codepen.io/TingKan/pen/gOvpbzY
-->

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答案 CodePen：
https://codepen.io/bonnieli1414/pen/abqOzaK
-->

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答案 CodePen：
https://codepen.io/shumhoyin/pen/MWQwYLE
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答案 CodePen:
https://codepen.io/ntjtcxpt-the-animator/pen/zYRGGrm?editors=0012
-->

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答案：
Codepen：https://codepen.io/bogwdnxx-the-sans/pen/bGLddBW
-->

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答案 CodePen:
https://codepen.io/chihsuanbjjh/pen/RwQPPVr?editors=1111
-->

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CodePen:
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https://codepen.io/wc-su/pen/RwQPPgr
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<!-- 22 shijia https://codepen.io/shijia22/pen/vYdOOJL?editors=0011 -->

<!-- 23 小鹿Kerwin#5730 https://codepen.io/tkoleo84119/pen/vYdOOzX?editors=0012 -->

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https://codepen.io/MochiCodingPen/pen/RwQPPvK
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<!-- 31. Peng
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<!-- 32. BeanHuang
https://codepen.io/Beanhuang/pen/KKQpdVJ?editors=0011
-->

<!-- 33. Murmurline#6969
答案：

function square(num){
  console.log (num * num);
}
square(3);
square(9);
square(20);

function calculate(num1, num2, num3){
  console.log (num1 + num2 - num3);
}
calculate(5,7,3)
calculate(9,8,7)
calculate(5,2,0)
calculate(9,9,33)

function rounding(num){
  var floor = Math.round(num * 100) / 100;
  var decimals = floor.toFixed(2);
  console.log (decimals);
}
rounding(3.9988);
rounding(3984.222);
rounding(77.777);

function parseNumber(str){
  console.log(Number(str));
}
parseNumber("2.33");
parseNumber("Hello!!");
parseNumber("30000");

function parseNumber(str){
  console.log(Number(str));
}
parseNumber("2.33");
parseNumber("Hello!!");
parseNumber("30000");

function divisible(num){ 
  console.log(Math.floor(num%2));
}
divisible(2);
divisible(3);
divisible(77);
divisible(88);

Codepen：https://codepen.io/murmurline/pen/MWQwaeM
-->

<!-- 34. Chi
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codepen：https://codepen.io/andy-ch-bo-an/pen/ZExyoGX?editors=1111
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<!-- 135. WangShuan(雅萱)#0947
const square = function (num) {
return parseInt(num)**2;
}

const calculate = function (num1, num2, num3) {
return parseInt(num1) + parseInt(num2) - parseInt(num3);
}

const rounding = function (num) {
return Math.round((num + Number.EPSILON) * 100) / 100
}

const parseNumber = function (str) {
return Number(str)
}

const divisible = function (num) {
return num % 2
}
-->

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