Let’s make a cube

float cube::GetVolume(){

return length*length*length;

}

float cube::GetSurface() {

return 6.*length*length;

}

cube::cube(float x){

length = x;

}

class cube {

protected:

float length;

public:

float GetVolume();

float GetSurface();

cube(float);

};

#include <iostream.h>

main()

{

float volume;

cube c( 2.);

volume = c.GetVolume();

cout << "volume is " << volume << endl;

}

Here we construct a new cube with size 2

Then we ask the cube to please calculate its volume and return it to us

Does this look familiar?