#include<iostream>
using namespace std;
class rectangle
{
double length;
public:
friend void printlength(rectangle R);
void setlength(double len);
};
void rectangle::setlength(double len)
{
length=len;
}
void printlength(rectangle rectangle)
{
cout<<"length of rectangle :"<<R.length<<endl;
}
int main()
{
rectangle R;
R.setlength(10.0);
printlength(R);
return 0;
}
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