Static Binding

Consider the following code, where the sum() function is overloaded to accept two and three integer arguments. Even though there are two functions with the same name inside the A class, the function call sum() binds to the correct function depending on the parameters passed to those functions. This binding is done statically during compile time.

class A {
      public:
      A(){
        std::cout<<"Constructor caled."<<"\n";
      }

      int sum(int a, int b) {
          return a + b;
      }

      int sum(int a, int b, int c) {
          return a + b + c;
      }
      ~A(){
        std::cout<<"Destructor caled."<<"\n";
      }
};

int main(int argc, char const *argv[]) {
  A obj;
  std::cout<<"Sum is = "<<obj.sum(1,3)<<"\n";
  std::cout<<"Sum is = "<<obj.sum(1,3,5)<<"\n";
  return 0;
}