写一个矩形类重载运行符"+",求两个矩形面积之和.
该如何写才能更快呢?

#include<iostream.h>
class R
{
public: R(int x,int y)
 {
 a=x;b=y;
 }
public :R()
  {
   a=b=0;
  }
friend R operator +(const R &c,const R &c2);
friend void print(const R &c);
private:
 int a,b;
};
R operator +(const R &c1,const R &c2)
{
 return R(c1.a*c1.b,c2.a*c2.b);
}
void print(const R &c)
{
 cout<<c.a+c.b<<endl;
}
 void main()
 {
   R c1(2,3),c2(4,2),c3;
   c3=c1+c2;
   print(c3);
 }