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                在很多時候,有些成員函數是在一個類內部才會被調用到,他們不應當被使用這個類的客戶代碼調用。例如,calculatePolar和calculateCartesianare會被訪問函數調用到,但客戶代碼不應該直接調用他們(雖然不會造成傷害)。如果我們想保護這些函數不被調用到,我們就需要把他們聲明為private,正如我們處理變量那樣。所以一個完整的復數類的定義如下: ~~~ class Complex { private: double real, imag; double mag, theta; bool cartesian, polar; void calculateCartesian (); void calculatePolar (); public: Complex () { cartesian = false; polar = false; } Complex (double r, double i) { real = r; imag = i; cartesian = true; polar = false; } void printCartesian (); void printPolar (); double getReal (); double getImag (); double getMag (); double getTheta (); void setCartesian (double r, double i); void setPolar (double m, double t); }; ~~~ 開頭的private標號不是必須的,但它是一個有用的提示符。
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