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計算導論與 C 語言基礎:第八週(C語言中的數據成分 Part II)

C語言中的數據成分 Part II




賦值運算符用法
基本注意事項:
✔ int a = 5;
✔ int a, b, c = 5;
❌ int a = b = c = 5


4 點要點說明



表達式:程序中油運算符號、操作數和括號組成的計算式,是計算求職的基本單位。


表達式的簡寫:
表達式的連續運算規則


算式表達式
*利用“%”運算,整數除以整數求出來的結果還是整數。
捨入(四捨五入)的結果會隨著編譯器的不同,而會有結果的差異。


當表達是相當複雜的時候如何處理?
剪刀法求值:
  1. 先對運算符級別低的進行
  2. 再由最後下刀的左右兩處進行求值
  3. 接著依序求值,如下


計算過程中的數據類型轉換:


自增、自減運算




終極繞口令~


關係運算符
(也有優先級)

邏輯表達式的取捨,有必要才要執行,不會做多餘的判斷









條件運算符




強制類型轉換



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