c++ class examples

#include <iostream>
using namespace std;

//Triangle class definition
class Triangle {
    int b, h;
  public:
    void set_values (int,int);          //prototype, definition outside
    int area () 
    {
        return (b*h)/2;
    }
};

/**
 * operator of scope (::, two colons), tt is used to define a member of a class 
 * from outside the class definition itself
 */
void Triangle::set_values (int a, int b) {
  Triangle::b = a;
  Triangle::h = b;
}

int main(int argc, char** argv) {
  Triangle tri;
  tri.set_values (3,4);
  cout << "Area of a triangle with base 3 and height 4: " << tri.area();
  return 0;
}

Output:

Area of a triangle with base 3 and height 4: 6