What is the difference between overloading and overriding in C++?

Point	Overloading	Overriding
Where	Same scope	Base and derived class
Parameters	Different	Same
Needs virtual	No	Yes (for run time behavior)
Decided	Compile time	Run time

#include <iostream>

struct Base {
    virtual void f() const { std::cout << "Base::f\n"; }
    void g(int) const { std::cout << "g(int)\n"; }
    void g(double) const { std::cout << "g(double)\n"; }       // overloading
};

struct Derived : Base {
    void f() const override { std::cout << "Derived::f\n"; }    // overriding
};

int main() {
    Derived d;
    const Base& b = d;
    b.f();
    b.g(1);
    b.g(1.5);
}

See Polymorphism and Function Overloading.

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