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// friend class #include <iostream> using namespace std; class Square; class Rectangle { int width, height; public: int area () {return (width * height);} void convert (Square a); }; class Square { friend class Rectangle; private: int side; public: Square (int a) : side(a) {} }; void Rectangle::convert (Square a) { width = a.side; height = a.side; } int main () { Rectangle rect; Square sqr (4); rect.convert(sqr); cout << rect.area(); return 0; }
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