eclipse - C++ getArea() and cout not working -

this code, relatively new c++. other c++ program i've ever written atm app. project, i'm trying find area of box, suggestions n why isn't working?

anyways heres code

/*  * c.cpp  *  *  created on: jan 31, 2014  *      author: university of denver. yeah, smoke weed.  */  class box {    public:       // pure virtual function       virtual double getvolume() = 0;    private:       double length;      // length of box       double breadth;     // breadth of box       double height;      // height of box };  #include <iostream>  using namespace std;  // base class class shape  { public:    // pure virtual function providing interface framework.    virtual int getarea() = 0;    void setwidth(int w)    {       width = w;    }    void setheight(int h)    {       height = h;    } protected:    int width;    int height; };  // derived classes class rectangle: public shape { public:    int getarea()    {        return (width * height);     } }; class triangle: public shape { public:    int getarea()    {        return (width * height)/2;     } };  int main(void) {    rectangle rect;    triangle  tri;     rect.setwidth(5);    rect.setheight(7);    // print area of object.    cout << "total rectangle area: " << rect.getarea() << endl;     tri.setwidth(5);    tri.setheight(7);    // print area of object.    cout << "total triangle area: " << tri.getarea() << endl;      return 0; } 

the code valid compiled , outputs 35 , 17. think problem console window closed system , not see result. can insert command wait until enter example

int i;  std::cin >> i; 

or similar before return

if use ms vc++ can run console applications key combination ctrl + f5

also take account class box not used , may removed.