Difference between Compile time and Runtime Polymorphism in C++

Example –

#include <iostream>
using namespace std;

class PrepInsta {
  public:
  void sum(int a)
  {
    cout << "Sum of the int type variable is:" << a << endl;
  }
  void sum(double a) {
    cout << "sum of the double type variable is:" << a << endl;
  }
  void sum(int a, int b) 
  {
    cout << "Sum of int type variables are:" << a + b << endl;
  }
   void sum(double a, double b) 
  {
    cout << "Sum of double type variables are:" << a + b << endl;
  }
};

int main() {
  PrepInsta obj;

  obj.sum(5);
  obj.sum(500.263);
  obj.sum(5,3);
  obj.sum(5.333,3.167);

return 0;
}

Output –

Sum of the int type variable is:5                                                                                                                                                           
sum of the double type variable is:500.263                                                                                                                                                  
Sum of int type variables are:8                                                                                                                                                             
Sum of double type variables are:8.5 

Now, in the above, the functions go to their correct argument type in class PrepInsta, this is called function overloading