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# Struct

struct Ball{

char color\[10];

double radius;

};

**宣告並設定**

struct Ball ball1 = {"red", 5.0};

**宣告再設定**

宣告 and instantiation (實例化)

`typedef`定義`struct`的名稱，如此一來，宣告並產生實例時，就不用再寫`struct`關鍵字

**Struct 可以直接用來 assign 複製本身值給另外一個 struct**

同理

Struct 若用在 function 引數傳遞 , 行為同樣是複製