1 #include <iostream> 2 using namespace std; 3   4 class rectangle 5 { 6 private: 7     int length,width; 8 public: 9     rectangle(){};10     rectangle(int a,int b);11     rectangle tlength(rectangle A,rectangle B);12     void display(rectangle C);13 };14 rectangle::rectangle(int a,int b)15 {16     length=a;width=b;17 }18 rectangle rectangle::tlength(rectangle A,rectangle B)19 {20     A.length= A.length + B.length;21     A.width=A.width+B.width;22     return A;23 }24 void rectangle::display(rectangle C)25 {26     cout<<(C.length+C.width)*2;27 }28 void main()29 {30     rectangle A(1,2),B(3,4),C;31     C=C.tlength(A,B);32     C.display(C);33 }