#include

using namespace std;

class rect

{

public:

rect(int width, int length) : width(width),length(length){}

int Area()

{

return length * width;

}

int Perimeter()

{

return 2 * (length + width);

}

friend int add(rect &r1, rect &r2);

private:

int length;

int width;

};

int add(rect &r1,rect &r2)

{

return r1.Area() + r2.Area();

}

int main()

{

rect rect1(2,4), rect2(4,6);

cout

cout

cout

cout

cout

return 0;

}

執行結果

rect1的面積是8

rect1的周長是12

rect2的面積是24

rect2的周長是20

rect1 和rect2的面積之和為32

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