Printing sum of values using friend function in C++

Example Program:

Here is the simple program for printing the sum of values(addition) using Friend Function in C++.

Source Code

using namespace std;
class B;
class A
    int numA;
    A(): numA(12) { }
    friend int add(A, B);
class B
    int numB;
    B(): numB(1) { }
    friend int add(A , B);
int add(A objectA, B objectB)
  return (objectA.numA + objectB.numB);
int main()
  A objectA;
  B objectB;
  cout<<"Sum: "<<add(objectA,objectB);
  return 0;
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Sum: 13

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