Classes and Objects in C++
practice.

Inline functions are avoided when . . . . . . . .

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
class rect
{
    int x, y;
    public:
    void val (int, int);
    int area ()
    {
        return (x * y);
    }
};
void rect::val (int a, int b)
{
    x = a;
    y = b;
}
int main ()
{
    rect rect;
    rect.val (3, 4);
    cout << "rect area: " << rect.area();
    return 0;
}

What is a friend function in C++?

Pick the correct statement.

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
class Box
{   
    double length;
    double breadth;
    double height;
    public:
    double getVolume(void)
    {  
        return length * breadth * height;
    }
    void setLength( double len )
    {   
        length = len;
    }
    void setBreadth( double bre )
    {   
        breadth = bre;
    }
    void setHeight( double hei )
    {   
        height = hei;
    }
    Box operator+(const Box& b)
    {  
        Box box;
        box.length = this->length + b.length;
        box.breadth = this->breadth + b.breadth;
        box.height = this->height + b.height;
        return box;
    } 
};
int main( )
{  
    Box Box1;
    Box Box2;
    Box Box3;
    double volume = 0.0;
    Box1.setLength(6.0);
    Box1.setBreadth(7.0);
    Box1.setHeight(5.0);
    Box2.setLength(12.0);
    Box2.setBreadth(13.0);
    Box2.setHeight(10.0);
    volume = Box1.getVolume();
    cout << "Volume of Box1 : " << volume <<endl;
    volume = Box2.getVolume();
    cout << "Volume of Box2 : " << volume <<endl;
    Box3 = Box1 + Box2;
    volume = Box3.getVolume();
    cout << "Volume of Box3 : " << volume <<endl;
    return 0;
}

How to declare operator function?

What will be the output of the following C++ code?

#include <iostream>
#include <string>
using namespace std;
int main ()
{
    string str ("Ubuntu");
    cout << str.capacity();
    cout << str.max_size();
    return 0;
}

What is the use of functor?

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
void duplicate (int& a, int& b, int& c)
{
    a *= 2;
    b *= 2;
    c *= 2;
}
int main ()
{
    int x = 1, y = 3, z = 7;
    duplicate (x, y, z);
    cout << x << y << z;
    return 0;
}

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
int main()
{
    int a = 20;
    int b = 10;
    int c = 15;
    int d = 5;
    int e;
    e = a + b * c / d;
    cout << e << endl ;
    return 0;
}

Which is used to tell the computer that where a pointer is pointing to?

What will be the output of the following C++ code?

#include <iostream>
#include <cmath>
using namespace std;
class Complex
{
    private:
    double real;
    double imag;
    public:
    Complex(double r = 0.0, double i = 0.0) : real(r), imag(i)
    {}
    double mag()
    {  
        return getMag();
    }
    operator double ()
    {
        return getMag();
    }
    private:
    double getMag()
    {
        return sqrt(real * real + imag * imag);
    }
};
int main()
{
    Complex com(3.0, 4.0);
    cout << com.mag();
    cout << com;
    return 0
}

What is the scope of typedef defined data types?

What is the associativity of add(+);?

Which is called ternary operator?

How the objects are self-referenced in a member function of that class.

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
class number
{
    int i;
    public:
    int geti();
    void puti(int j);
};
int number::geti()
{
    return i;
}
void number::puti(int j)
{
    i = j;
}
int main()
{
    number s;
    s.puti(10);
    cout << s.geti( );
    return 0;
}

How many objects can present in a single class?

How many member functions are there in this C++ class excluding constructors and destructors?

class Box
{
	int capacity;
   public:
	void print();
	friend void show();
	bool compare();
	friend bool lost();
};

In which form does the function call operator can be overloaded?