Breaking News: Grepper is joining You.com. Read the official announcement!

C++ friend keyword -3 (friend class)

Add Answer

VARAK-VURAK answered on April 3, 2022 Popularity 8/10 Helpfulness 1/10

answer C++ friend keyword -3 (friend class)

related c++ friend class

related friend Class in C++

related C++ friend keyword

related C++ friend keyword -2

C++ friend keyword -3 (friend class)

Comment

// C++ program to demonstrate the working of friend class

#include <iostream>
using namespace std;

// forward declaration
class ClassB;

class ClassA {
    private:
        int numA;

        // friend class declaration
        friend class ClassB;

    public:
        // constructor to initialize numA to 12
        ClassA() : numA(12) {}
};

class ClassB {
    private:
        int numB;

    public:
        // constructor to initialize numB to 1
        ClassB() : numB(1) {}
    
    // member function to add numA
    // from ClassA and numB from ClassB
    int add() {
        ClassA objectA;
        return objectA.numA + numB;
    }
};

int main() {
    ClassB objectB;
    cout << "Sum: " << objectB.add();
    return 0;
}
//Sum: 13

Popularity 8/10 Helpfulness 1/10 Language cpp

Source: www.programiz.com

Tags: c++ friend keyword

Link to this answer
Share Copy Link

Contributed on Sep 19 2022

VARAK-VURAK

0 Answers Avg Quality 2/10

Closely Related Answers

c++ friend class

Comment

class A {
  	private:
      	int key;

 	// give class B access to class A
    friend class B;
};

class B {
	// new object from class A
  	A new_a;
  
  	void fn(){
		// access private value from class B
		new_a.key;
    }
}

Popularity 10/10 Helpfulness 4/10 Language cpp

Source: www.geeksforgeeks.org

Tags: c++

Link to this answer
Share Copy Link

Contributed on Apr 03 2022

ocean

0 Answers Avg Quality 2/10

friend Class in C++

Comment

class ClassB;

class ClassA {
   // ClassB is a friend class of ClassA
   friend class ClassB;
   ... .. ...
}

class ClassB {
   ... .. ...
}

Popularity 9/10 Helpfulness 3/10 Language cpp

Source: Grepper

Tags: c++

Link to this answer
Share Copy Link

Contributed on Jun 13 2022

SAMER SAEID

0 Answers Avg Quality 2/10

friend Class in C++

Comment

class ClassB;

class ClassA {
   // ClassB is a friend class of ClassA
   friend class ClassB;
   ... .. ...
}

class ClassB {
   ... .. ...
}

Popularity 9/10 Helpfulness 2/10 Language cpp

Source: Grepper

Tags: c++

Link to this answer
Share Copy Link

Contributed on Jun 13 2022

SAMER SAEID

0 Answers Avg Quality 2/10

friend Class in C++

Comment

class ClassB;

class ClassA {
   // ClassB is a friend class of ClassA
   friend class ClassB;
   ... .. ...
}

class ClassB {
   ... .. ...
}

Popularity 9/10 Helpfulness 1/10 Language cpp

Source: Grepper

Tags: c++

Link to this answer
Share Copy Link

Contributed on Jun 13 2022

SAMER SAEID

0 Answers Avg Quality 2/10

friend Class in C++

Comment

class ClassB;

class ClassA {
   // ClassB is a friend class of ClassA
   friend class ClassB;
   ... .. ...
}

class ClassB {
   ... .. ...
}

Popularity 9/10 Helpfulness 1/10 Language cpp

Source: Grepper

Tags: c++

Link to this answer
Share Copy Link

Contributed on Jun 13 2022

SAMER SAEID

0 Answers Avg Quality 2/10

friend Class in C++

Comment

class ClassB;

class ClassA {
   // ClassB is a friend class of ClassA
   friend class ClassB;
   ... .. ...
}

class ClassB {
   ... .. ...
}

Popularity 9/10 Helpfulness 1/10 Language cpp

Source: Grepper

Tags: c++

Link to this answer
Share Copy Link

Contributed on Jun 13 2022

SAMER SAEID

0 Answers Avg Quality 2/10

friend Class in C++

Comment

class ClassB;

class ClassA {
   // ClassB is a friend class of ClassA
   friend class ClassB;
   ... .. ...
}

class ClassB {
   ... .. ...
}

Popularity 9/10 Helpfulness 1/10 Language cpp

Source: Grepper

Tags: c++

Link to this answer
Share Copy Link

Contributed on Jun 13 2022

SAMER SAEID

0 Answers Avg Quality 2/10

C++ friend keyword

Comment

// Add members of two different classes using friend functions

#include <iostream>
using namespace std;

// forward declaration
class ClassB;

class ClassA {
    
    public:
        // constructor to initialize numA to 12
        ClassA() : numA(12) {}
        
    private:
        int numA;
        
         // friend function declaration
         friend int add(ClassA, ClassB);
};

class ClassB {

    public:
        // constructor to initialize numB to 1
        ClassB() : numB(1) {}
    
    private:
        int numB;
 
        // friend function declaration
        friend int add(ClassA, ClassB);
};

// access members of both classes
int add(ClassA objectA, ClassB objectB) {
    return (objectA.numA + objectB.numB);
}

int main() {
    ClassA objectA;
    ClassB objectB;
    cout << "Sum: " << add(objectA, objectB);
    return 0;
}

Popularity 8/10 Helpfulness 1/10 Language cpp

Source: www.programiz.com

Tags: c++ friend

Link to this answer
Share Copy Link

Contributed on Sep 19 2022

VARAK-VURAK

0 Answers Avg Quality 2/10

C++ friend keyword -2

Comment

// C++ program to demonstrate the working of friend function

#include <iostream>
using namespace std;

class Distance {
    private:
        int meter;
        
        // friend function
        friend int addFive(Distance);

    public:
        Distance() : meter(0) {}
        
};

// friend function definition
int addFive(Distance d) {

    //accessing private members from the friend function
    d.meter += 5;
    return d.meter;
}

int main() {
    Distance D;
    cout << "Distance: " << addFive(D);
    return 0;
}

Popularity 1/10 Helpfulness 1/10 Language cpp

Source: www.programiz.com

Tags: c++ friend keyword

Link to this answer
Share Copy Link

Contributed on Sep 19 2022

VARAK-VURAK

0 Answers Avg Quality 2/10

C++ friend keyword -3 (friend class)

Contents

More Related Answers

C++ friend keyword -3 (friend class)

Closely Related Answers

c++ friend class

friend Class in C++

friend Class in C++

friend Class in C++

friend Class in C++

friend Class in C++

friend Class in C++

C++ friend keyword

C++ friend keyword -2

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.