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                # C++ 下標運算符 [] 重載 下標操作符 [] 通常用于訪問數組元素。這個運算符符可被重載用于增強操作 C++ 數組的功能。 下面的實例演示了如何重載下標運算符 []。 ``` #include <iostream> using namespace std; const int SIZE = 10; class safearay { private: int arr[SIZE]; public: safearay() { register int i; for(i = 0; i < SIZE; i++) { arr[i] = i; } } int &operator[](int i) { if( i > SIZE ) { cout << "Index out of bounds" <<endl; // 返回第一個元素 return arr[0]; } return arr[i]; } }; int main() { safearay A; cout << "Value of A[2] : " << A[2] <<endl; cout << "Value of A[5] : " << A[5]<<endl; cout << "Value of A[12] : " << A[12]<<endl; return 0; } ``` 當上面的代碼被編譯和執行時,它會產生下列結果: ``` Value of A[2] : 2 Value of A[5] : 5 Index out of bounds Value of A[12] : 0 ```
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