I have been trying to make a physics class for to test on an gui, but when I get the output, it's not a # persay. I'm not even sure if the physics are right, and I will be looking into it, but I'm posting here to find out why i didn't get a #. If you see any problems with the physics part of it that would be greatly appreciated too.

Here is my code

Code:

#include <iostream>
#include <vector>
using namespace std;
vector <float> force;
class physics
{
public:
physics(double x, double y, double h, double w, double top_speed, double density, double friction_level);
void apply_force(vector <float> force);
private:
vector <double> main_vector;
};
physics::physics(double x, double y, double h, double w, double top_speed, double density, double friction_level)
{
//set up main vector
main_vector.push_back(x);
main_vector.push_back(y);
main_vector.push_back(h);
main_vector.push_back(w);
main_vector.push_back(top_speed);
main_vector.push_back(density);
main_vector.push_back(friction_level);
// find volume and mass
// first we will find volume = h * w
main_vector.push_back(main_vector[2] * main_vector[3]);
// now lets find mass = V * D
main_vector.push_back(main_vector[6] * main_vector[8]);
// now we are going to find the gravity of the object using force = mass * 9.8(earth grav)
main_vector.push_back(main_vector[9] * 9.8);
// find friction
main_vector.push_back(main_vector[6] * main_vector[10]);
//lets make some room to put acceleration in there! remember we need one for x and y
main_vector.push_back(0);
main_vector.push_back(0);
}
void physics::apply_force(vector <float> force)
{
// acceleration = force/ mass * for both x and y
// also not we subtract friction from it
if(force[0]/main_vector[8] > 0)
{
main_vector[12] = (force[0] - main_vector[11] )/main_vector[8] ;
}
if(force[0]/main_vector[8] <= 0)
{
main_vector[12] = (force[0] - main_vector[11]) /main_vector[8] ;
}
if(force[1]/main_vector[8] > 0)
{
main_vector[13] = (force[1] - main_vector[11]) /main_vector[8];
}
if(force[1]/main_vector[8] <= 0)
{
main_vector[13] = (force[1] - main_vector[11]) /main_vector[8];
}
main_vector[0] += main_vector[12];
main_vector[1] += main_vector[13];
cout<< main_vector[0] << ", " << main_vector[1] << "\n";
}
int main()
{
force.push_back(10);
force.push_back(30);
physics car(5, 5, 25, 25, 20, 40, 0.5);
car.apply_force(force);
return 0;
}

and my output is:

1.#INF, 1.#INF

Thanks for any help,

Joe