It's a wrong code

private1.cpp

// c++ oop private access modifier

#include <iostream>

using namespace std;

// defining a class
class Circle {
    private:                     // we defined that this class data members will be private
        double radius;
    
    public:                     // and we kept the member function public
        double compute_area(){          
            return 3.14*radius*radius;      // member function can access private data member radius
        }
};                              // always put semicolons after defining a class

//main function
int main(){
    Circle ball;                // create a object called ball
    
    ball.radius = 3.5;          // trying to access private data member radius directly from outside the class (It's PROHIBETED)
    
    cout << "Radius is: " << ball.radius << endl;
    cout << "Area is: " << ball.compute_area();
    
    return 0;
}