Constructor in Multiple Inheritance in C++

// C++ program to implement
// constructor in multiple 
// inheritance
#include<iostream>
using namespace std;
class A1
{
  public:
  A1()
  {
    cout << "Constructor of the base class A1 \n";
  }
};
class A2
{
  public:
  A2()
  {
    cout << "Constructor of the base class A2 \n";
  }
};
class S: public A1, virtual A2
{
  public:
  S(): A1(), A2()
  {
    cout << "Constructor of the derived class S \n";
  }
};
// Driver code
int main()
{
  S obj;
  return 0;
}

// C++ program to implement
// constructors in multiple
// inheritance
#include<iostream>
using namespace std;
class A1
{
    public:
        A1()
        {
            int a = 20, b = 35, c;
            c = a + b;
            cout << "Sum is:" << 
                     c << endl;
        }
};
class A2
{
    public:
        A2()
        {
            int x = 50, y = 42, z;
            z = x - y;
            cout << "Difference is:" << 
                     z << endl;
        }
};
class S: public A1,virtual A2
{
    public:
        S(): A1(), A2()
        {
            int r = 40, s = 8, t;
            t = r * s;
            cout << "Product is:" << 
                     t << endl;
        }
};
// Driver code
int main()
{
    S obj;
    return 0;
}