#include  #include  using namespace std; class Circle { public: double pi; double radius; public: Circle(){ pi = 3.14159; radius = 1.0; } void setRadius(double r){ radius = r; } double getRadius(){ return radius; } double getArea(){ return pi*radius*radius; } }; int main() { int r; cout<<"Enter radius: "; cin>>r; Circle c; c.setRadius(r); cout<<"Area = "< 
In C++ add a default constructor to the Circle class in source code above. The constructor should initialize the radius member to 0