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跳至主要內容
文章觀看次數: 371
前言 前幾篇介紹了資料基本型態以及一些邏輯判斷
這一篇來介紹程式的另一個基本
相信第一次接觸程式的人，看到 i = i+1 的瞬間就會愣住了
這是蝦米碗糕，那如果我們把 i 代入 1
1 = 1+1 ➡ 1 = 2
難道工程師數學都爛的一蹋糊塗的嗎!? 那肯定不是的
那就讓我們進入今天的主題 「運算子」
運算子 定義 : 是一種符號或符號組合，用於指定要對參數進行的特定操作。
目的 :
執行數學計算，像是基本的加減乘除 控制流程，其實就是前面兩章介紹過的邏輯判斷那種的 操作位元，這個屬於比較進階的運用了，有機會再介紹下
運算子可以分為以下幾類
算數運算子 用於執行數學的基本判斷，我們平常數學用到的加減乘除都在此類
+ – * / % 這個比較特殊，是取餘數的意思，舉個範例來說 7%3 = 1 就是7扣掉能被3整除的6之後，剩下的餘數為1
算數運算子很常被運用於各種場合
⭐這裡說明一下最令人感到困惑的 i = i+1
在這裡的 = 為賦值
所以，意思就是我要把 i 的值變成 i+1的值，後面的那個 i 就是本來的值 ➡ 我要讓 i 這個值+1
擴展運算子 算是算術運算子
運算子 範例 也等於 += i += 2 i = i+2 -= i -= 2 i = i-2 *= i *= 2 i = i*2 /= i /= 2 i = i/2 %= i %= 2 i = i%2
沒錯，工程師就是懶成這樣，這樣就可以少寫一個字了哈哈
不過要留心的是，以筆者多年的經驗
寫 i+=1的比例 比 i = i+1 高多了，所以還是得會這個方法的
比較運算子 用於比較兩個值的關係，並回傳布林值 (true、false)
> 大於 < 小於 >= 大於等於 <= 小於等於 == 等於 != 不等於 這個…我應該不用說明吧
用來進行邏輯上的判斷
&& And運算子 || OR運算子 ! NOT運算子 這個應該相對比較好理解
&&就是前後都要符合才會回傳true
|| 則是前後一個成立 (true) 就會回傳true
! NOT運算子則是回傳完全相反的結果， 舉例來說 : !(1==1) ➡ !(true) ➡ false
主要就是用來進行二進位的計算
常見的幾種有
運算子 用途 & AND運算 | OR運算 ~ 對位元進行反轉 ^ XOR運算 << 位元向左移動一位 >> 位元向右移動一位
二進位Binary的概念因為在前幾章還沒說明，所以這邊就先擱置
大致概念就是 0 跟 1 組成的資料，現代程式都是基於二進位的肩膀上開發的
( 因為 0可以代表 false，而1則為true，所以可以進行各類運算)
有一些興趣的同學，可以先看一篇實務應用的文章 – 從實務應用出發 – 如何透過二進位控管人員權限
結論 隔了許久，總算回來寫第四篇了，真的不容易啊哈哈
這篇裡面講解了程式的基本操作，主要都是對邏輯跟架構上會用到的運算子
不知道按照這個速度，多久可以到實作層呢
如果大家有想看的也請不吝留言告訴我一聲
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