c. Only 1, 4
Explain advantages of using friend classes?
What is a friend function?
Explain the characteristics of friend functions?
Explain friend function?
What are friend classes?
What is the output of this program?
#include <iostream>
using namespace std;
class Box
{
double width;
public
friend void printWidth( Box box );
void setWidth( double wid );
};
void BoxsetWidth( double wid )
{
width = wid;
}
void printWidth( Box box )
{
box.width = box.width * 2;
cout << "Width of box " << box.width << endl;
}
int main( )
{
Box box;
box.setWidth(10.0);
printWidth( box );
return 0;
}
a) 40
b) 5
c) 10
d) 20Which keyword is used to declare the friend function? a) firend b) friend c) classfriend d) myfriend
Which rule will not affect the friend function? a) private and protected members of a class cannot be accessed from outside b) private and protected member can be accessed anywhere c) both a & b d) None of the mentioned
What is the output of this program?
#include <iostream>
using namespace std;
class sample
{
int width, height;
public
void set_values (int, int);
int area () {return (width * height);}
friend sample duplicate (sample);
};
void sampleset_values (int a, int b)
{
width = a;
height = b;
}
sample duplicate (sample rectparam)
{
sample rectres;
rectres.width = rectparam.width * 2;
rectres.height = rectparam.height * 2;
return (rectres);
}
int main ()
{
sample rect, rectb;
rect.set_values (2, 3);
rectb = duplicate (rect);
cout << rectb.area();
return 0;
}
a) 20
b) 16
c) 24List the advantages of using friend classes?
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