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                # C++ 關系運算符重載 C++ 語言支持各種關系運算符( &lt; 、 &gt; 、 &lt;= 、 &gt;= 、 == 等等),它們可用于比較 C++ 內置的數據類型。 您可以重載任何一個關系運算符,重載后的關系運算符可用于比較類的對象。 下面的實例演示了如何重載 &lt; 運算符,類似地,您也可以嘗試重載其他的關系運算符。 ``` #include <iostream> using namespace std; class Distance { private: int feet; // 0 到無窮 int inches; // 0 到 12 public: // 所需的構造函數 Distance(){ feet = 0; inches = 0; } Distance(int f, int i){ feet = f; inches = i; } // 顯示距離的方法 void displayDistance() { cout << "F: " << feet << " I:" << inches <<endl; } // 重載負運算符( - ) Distance operator- () { feet = -feet; inches = -inches; return Distance(feet, inches); } // 重載小于運算符( < ) bool operator <(const Distance& d) { if(feet < d.feet) { return true; } if(feet == d.feet && inches < d.inches) { return true; } return false; } }; int main() { Distance D1(11, 10), D2(5, 11); if( D1 < D2 ) { cout << "D1 is less than D2 " << endl; } else { cout << "D2 is less than D1 " << endl; } return 0; } ``` 當上面的代碼被編譯和執行時,它會產生下列結果: ``` D2 is less than D1 ```
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