method overloading in C++
``` #include <iostream> using namespace std; class Addition { public: int sum(int a,int b) { return a+b; } int sum(int a,int b, int c) { return a+b+c; } }; int main(void) { Addition obj; cout<<obj.sum(20, 15)<<endl; cout<<obj.sum(81, 100, 10); return 0; } ```