C++ Examples

Write a C++ Program to print a welcome text in a separate line.
Write a Program in C++ to add two numbers.
C++ program for addition of two numbers using functions.
Add two numbers in C++ using class.
Addition of two numbers using call by reference in C++
C++ program to write a program to add two numbers using call by value.
Swapping of two numbers in C++ without using third variable.
Swap two numbers in C++ using function.
C++ program to swap two numbers using class.
C++ program to swap two numbers using call by value.
C++ program to swap two numbers using pointers.
Write a program to swap private data members of two classes using friend function.
write a program to add data objects of two different classes using friend function.
Threading in C++.
C++ thread lambda
C++ thread lambda with parameter
C++ thread lambda pass by reference
Singleton C++ example

Write a program to add data objects of two different classes using friend function.

#include<iostream>
using namespace std;

//class declaration 
class a2;
class a1
{
    private:
       
       int num1 = 45;

    friend int add(a1 obj1 , a2 obj2);  
};

class a2
{
    private:
       
       int num2 = 70;
    
    friend int add(a1 obj1 , a2 obj2);
};

//function to add two class members

int add(a1 obj1 , a2 obj2)
{
    return obj1.num1 + obj2.num2;
}

int main()
{   
  a1 obj1;
  a2 obj2;
  
  cout<<"Addition of numbers is "<<add(obj1,obj2);
}

Output

Addition of numbers is 115