C++點類派生三角形求面積，周長，構造析構函數

僅供參考 #include <iostream> #include <math.h> using namespace std; class myPoint { public: myPoint(double x0 = 0.0, double y0 = 0.0) :x(x0), y(y0) {} myPoint(myPoint &np) :x(np.x), y(np.y) {} double G

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